Canine Capers

Following a very poor winter period, spring has been nothing less than spectacular and provided many clear nights for astronomy, ironically made all the better by the covid-19 lockdown.  With the near absence of road traffic and especially aircraft – Fairvale Observatory is badly affected by flights from nearby Gatwick, Heathrow and Redhill aerodrome – it has resulted in noticeably better seeing, as well as a quieter and more enjoyable environment overall; it’s worth noting that after experimenting with Deep Sky Stacker (DSS), increasing the Kappa-Sigma clipping parameter from 2.0 to 2.50 for the light subs, in all but the worst cases eliminated aircraft tracks in the final stacked image.  Resulting from these favourable conditions, I’ve recently been able to image four otherwise difficult targets, amounting to some 40-hours total integration time, literally unprecedented conditions in the +30 years I’ve lived here.

CanVen Map

Apart from a brief diversion imaging the Leo Triplet, my attention has otherwise been centered on the constellation of Canes Venatici, AKA the Hunting Dogs.  At this time of the year the constellation starts to come into view high overhead from the east at about 10 p.m. and crosses the meridian about three hours later.  Located below Ursa Major and above Bootes, the relatively small Canes Venatici hosts five Messier objects, four of which are galaxies and it is these I’ve been drawn to.  From earlier test shots I determined that the M94 galaxy was unlikely to be suitable for my equipment but I did obtain and have already described images of first M106 and then M63.  Notwithstanding, I had unfinished business with the last of the four galaxies, which I therefore now turned to.

In 2019 I was pleased to acquire my first ever image of the wonderful M51Whirlpool Galaxy and its smaller companion, NGC 5195.  However, I noted then that the final LRGB image still needed much more integration time than just 2hr 18min. achieved, plus the addition of Ha-subs and that I hoped to return to the Whirlpool and its neighbour as soon as possible for this purpose.

M51 HaLRGBFinal-denoise-denoise

It was therefore a great pleasure to image M51 over no less than seven nights in March and April this spring, which combined with last year’s data resulted in over 16 hours integration time, substantially longer than any previous image I’ve compiled before.  Moreover, the quality of seeing also benefitted SNR and guiding quality, thus achieving RMS errors of at least 0.80 arc seconds or better.  I did encounter some plate solving issues and had to resort to manual framing on a few nights but fortunately DSS software dealt with alignment OK and the final image is all I could have hoped for (see above + top-of-the-page cropped).  Naturally the interaction of the two galaxies is the signature feature of this image but it is the improvement in general colour, detail and addition of Ha-subs highlighting regions of new star formation, that have been most transformative in portraying these objects in all their glory.

Using my current set-up it seems unlikely that the image would benefit significantly from any further data acquisition but I’d like to think I’ll return another day using a larger telescope and higher resolution with which to capture and enjoy even more detail of all these exciting objects of Canes Venatici.  It is said that “it’s an ill wind that blows no good” and I am doubtful we’ll ever have such good conditions here again but for now I was delighted to be able to positively exploit this otherwise difficult time in lockdown.

  IMAGING DETAILS
Object M51 The Whirlpool Galaxy & NGC 5951
Constellation Canes Venatici
Distance 23 million light-years
Size 11.2’ x 6.9’   77,000 light-years (M51 only)
Apparent Magnitude +8.4
   
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWO x8 ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 13:30:03      DEC 47:11:43  (approx.)                   Top  = South  Bottom = North 
Exposures L x 95   R x 62   G x58   B x 66   Ha x 46 = 327 x 180 sec                                                         Total Integration Time: 16hr 21 minutes   
  @ 139 Gain   21  Offset @ -20oC    
Calibration 10 x 180 sec  Darks  20 x 1/4000 sec Bias  10 x  HaLRGB Flats                             @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 10th April 2019 +23rd 24th 25th 27th March & 20th 21st 22nd April 2020@ +22.00h
Weather Approx. 6oC   RH <=60%                  🌙 New Moon approx.

Galactic Bloom

 

M63 HaLRGB FinalCropRotate3 (Large)-denoise-denoise

You don’t have to be an astronomer to appreciate Van Gogh’s wonderful evocation of the night sky in his 1889 painting Starry Night.  He knew a thing or two about sunflowers too and I’ve often stopped by the National Gallery in Trafalgar Square to take a peep at his famous painting of them.  However, it was still more than thirty years after completing these paintings that we first learned that such features as galaxies and the rest of the Universe even existed beyond our own Milky Way.  Since then our knowledge of the cosmos has expanded considerably and today provides no end of imaging opportunities for the astrophotographer, subject to clear skies!

Having started the galaxy season with M106 and, given the excellent conditions that prevailed throughout much of Spring this year, I chose to return to the same area of the sky again to image M63, AKA the Sunflower Galaxy.  M63 has a spiral form but with no apparent central bar and in visible light lacks large scale spiral structure, although two-arm structures are noticeable in near infra-red.  Instead the dust lanes are extensively disrupted producing a patchy appearance and is thus classified as a flocculent galaxy – in this case looking something like a sunflower.

As previously discussed, most galaxies are a real challenge for my equipment but an earlier experiment indicated it might just be possible to image M63, the trick would be obtaining sufficient integration time.  Fortunately three clear nights approaching a new moon in April provided over 8-hours of good subs, which I’m pleased to say resulted in a decent final image after all.  The background sky is less busy than I would wish but there’s nice colour in the stars and also a few very small faint fuzzies on close inspection.  Notwithstanding,  M63 is clearly the star of the show (no pun intended) with the so-called flocculation clearly evident and numerous random dust lanes criss-crossing the entire galactic disc.

Although in 1924 Edwin Hubble’s recognition that galaxies, such as our own, existed outside the Milky Way, M63 was discovered by Pierre Méchain and catalogued by Charles Messier in 1779, long before Van Gogh’s paintings.  He might conceivably have known of its presence therefore but not what it was and would surely be inspired to see and know about the Sunflower Galaxy as we do today.

IMAGING DETAILS
Object M63, NGC 5055 AKA Sunflower Galaxy
Constellation Canes Venatici
Distance 29 million light-years
Size 12.6’ x 7.2’
Apparent Magnitude +9.3
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 13h 15m 49.47”      DEC +42o 01’ 45.62”                     

Top = North approx..     

Exposures 30 x L  17 x R  18 x G  23 x B  12 x Ha x 300 sec

Total Time:  8hr 20 min    

  @ 139 Gain   21  Offset @ -20oC    
Calibration 5 x 300 sec Ha + 10 X 300’ RGB  Darks,  20 x 1/4000 sec Bias  10 x  HaRGB Flats               @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 14th 15th & 16th April 2020  @ +22.00h  
Weather Approx. <=8oC   RH 60 – 70%                  🌙 40% waning

Reflections 2019

The website Watch This Space (Man) began in 2015 as I started out in astronomy and is a record of my personal journey, comments and thoughts.  Apart from the main blog, the website also contains links to other astrophotographers, astronomy tools, astronomy weather, and scientific papers etc., which can be accessed from the top menu.

Whilst there is a photo gallery of my work in this website, an overview of the better images can be found in the My Astrophotography FLICKR album, which can be found in the GALLERY menu.  Furthermore, this year I took the plunge and joined the Astrobin community, where my images can be found using the appropriate link also in the GALLERY menu.

Heat Map 2019

During the past year the site was visited from 64 different countries, literally from every corner of the world.  I always like to hear from anybody out there – comments, questions, help or just to say hello  – and can be contacted via details given in the ABOUT menu section or just leave a comment on any item if you prefer.

Reflections 2019 BannerX

Reflections is compiled at the end of each year as a review of my astronomy and astrophotography during the previous twelve months, together with some thoughts on possible future developments.

Overview, Images & Goals for 2020

The past year’s plan was simple: build-on and experiment with developments from the previous year, in particular using Plate Solving to achieve longer integration times and explore further the north sky, which I could now see from the new Shed Observatory and operates during the spring and summer months.

By routinely using Plate Solving integration times, now obtained over a number of nights or even months, have increased by up to four-fold compared to previous years.  As a result I concentrated on less objects but for longer time, achieving between 6 to 8 hours of subs on some occasions, the limiting factor as ever being British weather.  Although quite modest compared to those able to use fixed observatories, or in clear, dry climates with Bortle 1 or 2 skies, I was very pleased with the positive impact this had on my images.

Starting astronomy and astrophotography somewhat late in the day a few years ago, like many others after retirement, the learning curve was steep and often frustrating.  There were times I’ve almost considered giving up but with perseverance I’ve made progress and often get great pleasure from some of the results, as well as just enjoying and learning about this wonderful subject.  For me it is just a hobby but recognising some of my achievements and abilities acquired since starting out in 2014, I was especially proud this year to be elected a Fellow of the Royal Astronomical Society.  For all the help in reaching this point, I’d like to thank all those who have helped me from the astronomy community, wherever they are.

RAS logo

Favourite Images

My weakness in astrophotography remains processing but having at last obtained some good integration times, this year I made a greater effort to improve these techniques – with some success.  Adopting the theme less is more, I imaged just 17 different objects this year – of which nine were full narrow or broadfband images, with the rest being  experimental or DSLR – with a total integration time of 65 hours (2018: 25 objects & 43 hours).  The resulting images turned out well, achieving Picture of the Week on the British Astronomical Association website on six occasions.  It’s therefore difficult to choose favourites from this select group based on merit alone, so this year’s favourites (see below) represent those good images that also mark a significant milestone in my astrophotography.  Detailed reviews of these and all other images from 2019 are discussed in dedicated articles that can be found via the Blog Index under the ABOUT dropdown menu.

SHO2 CompF (Large)

Horsehead & Flame Nebula: Usually imaged in LRGB broadband, this narrowband SHO version produced a very different affect and colours, whilst also showing the beauty of the accompanying clouds of interstellar gas and dust.  Taken over three nights, at nearly 7-hours, this image was also one of my longest integration times to date.     

M101 HaLRGB final Closeup

M101 Pinwheel Galaxy: Given Bortle 5-6 skies, being on the Gatwick Airport flightpath and a using a small refractor, I struggle to image galaxies and often LRGB images in general from Fairvale Observatory.  However, on this occasion the combination of 5-hours HaLRGB subs and new processing techniques to enhance the colours, M101 proved the exception and is perhaps my first decent classic spiral galaxy imaged from home.  Moreover, the HII regions light up along the spiral arms with the addition of Ha wavelength, producing a dazzling and dynamic image. 

Picture saved with settings embedded.

Heart & Soul Nebula:  Combining existing data from 2018 of the Heart Nebula and new 2019 data of the Soul Nebula + the intervening space, this is my first albeit modest mosaic, which promises to open up significant possibilities in the future. 

RECORD CARD – 2019
Goal Specifics / Results Outcome
Improve broadband and narrowband imaging

 

Achieved major increase of image integration times and overall quality. MUCH, MUCH BETTER

 

Improve processing Continuing to make slow improvements, with greater use of new Photoshop techniques. BETTER

 

Expand & Improve Widefield Imaging Despite some good images of the Milky Way in the USA, I never used the Vixen Polarie tracking mount and did not make it to any other dark sky sites  = disappointing. FAILED

 

My objectives in 2019 mostly went well in (see above), so here goes for 2020:

  • Imaging: There’s always scope to improve imaging techniques but probably most of all I still need to improve guiding quality and increase exposure and image integration times even further.
  • Mosaic: Expand the use of mosaic imaging using Plate Solving and new CdC planning software.
  • Improve processing: I expect this will continue to be something of a challenge for some time to come unless I go to the dark side and adopt software such as PixInsight & / or APP.
  • New Observatory: Unfortunately this will not be a fixed obsy whilst I continue to live here at Fairvale which is unsuitable.  However, I’m hopeful that another location between the Main (North) Observatory and the Shed Observatory might open up the north sky better and by getting away from the high hedges that surround the garden allow longer imaging sessions than can be currently obtained at the Shed.
  • Other: My mind is always thinking about larger telescopes or a dual rig and / or a new high-end encoded mount but probably not until I make further progress with the above goals and / or move to a better dark sky location – dreaming is part of astrophotography = watch this space!

Although you never know, I don’t see any major breakthroughs in the coming year but more of the same – revisiting familiar objects in order to obtain new image versions based on greater integration time and hopefully using mosaic techniques to build-out images in order to encompass wider areas of the sky.  This year I was surprised to discover objects that I had hitherto considered out of reach from my location (M101, M51 etc.), as well as exciting features that were completely new to me and still hold great promise e.g. DWB 111 AKA the Propeller Nebula.

Looking back I’m very happy to say 2019 was an excellent year for astronomy and astrophotography, almost certainly my best yet.  You can’t ask for more than that and I hope that WTSM’s Reflections 2020 will record further such success.

Watch this space!

wtsm logo

 

2019 CHRONICLE 

Below is a quarter by quarter summary of my astronomy and astrophotography for the year, followed by an imaging record.

JANUARY TO MARCH

Towards the end of 2018 I decided to undertake a project, with the prime objective to gather a much longer period of integration than hitherto achieved by using my newly developed skill of Plate Solving.  I’d previously imaged the Horsehead and Flame Nebula in the more traditional colour palette, either with a modded DSLR or by LRGB broadband.  However, I’d recently seen this iconic image undertaken using the Hubble Palette to great affect and was inspired to do the same myself. Thereafter, for more than 2-months the clouds rolled in and I thought my project would then be impossible, not least because by now Orion had crossed the Meridian in the early evening and imaging times were at best limited.  But as is often the case with astrophotography everything suddenly changed and it was game on!

The first evening of clear skies since 11th November 2018 coincided with the full lunar eclipse on 21st January, which I was therefore able to image once again.  Then six days later a very untypical clear and quite warm period of weather arrived and I was able to complete my intended project after all, with further time to image both the Great Orion Nebula and the reflection nebula M78 + Barnard’s Loop (see images below).

HaLRGB2FINALcrop (Large)

Combined +180 degrees 3+5min HaLRGB (Large)

Achieving much longer integration times of between 5 and nearly 8-hours, the impact on the resulting images was transformative.  I was especially pleased with the outcome of the Horsehead project in SHO (see Favourites Images section) but found the Ha-only starless version of the same scene (see below) particularly mesmerising, as the large HII structures throughout this region bring the image to life.

NGC 2024 Ha Starless2

By the end of February the night sky at 51o latitude has moved inexorably on to the so-called Galaxy Season, which provides something of a dearth of imaging opportunities for my 81mm telescope.  However, with a good patch of weather at the end of March, whilst experimenting with the Leo Group I noticed that small areas of Ursa Major region could be seen directly above for a couple of hours, which to my surprise opened up a whole new world of possibilities hitherto considered unavailable.  Shortly after I managed to obtain almost 5-hours of data on M101 the Pinwheel Galaxy, which is one of my best galaxy images taken from Fairvale Observatory (see Favourite Images section).

APRIL TO JUNE

Having discovered the albeit limited possibilities of seeing Ursa Major, I moved to the Shed Observatory early in April, which by then afforded slightly better views of the same area of sky and thereby to my great joy provided the possibility of imaging the wonderful Whirlpool Galaxy, M51.  Unfortunately time was somewhat limited but it was better than nothing and I was thrilled to obtain an image of this wonderful object for the first time.  Weather permitting I’ll be back for more data in 2020 with which to build on the promising result obtained this year.

LRGB Image FINALX2 (Large)

By the end of April just 8-weeks away from the summer solstice astronomical darkness is in short supply.  Fortunately having moved earlier to the Shed Observatory this year, I was in a good position to return to inaging the Bodes and Cigar Galaxies (see below), which had been my first ever image of north sky objects in 2018.

LRGBFinal (Large)

JULY TO SEPTEMBER

From May until late July the absence of Astronomical darkness makes astronomy difficult and frankly having progressed from the time of being a beginner, it is quite refreshing to take a break.  Therefore it was only after an evening viewing the partial eclipse on 16th July and a brief experiment with the Wizzard Nebula (something for the future) at the beginning of August, that much later I returned to astrophotography seriously.

SHO2SCcrop (Large)

Having messed up imaging the Soul Nebula with poor framing in 2018 and being at the Shed Observatory, I decided to re-image the Soul properly, together with some of the adjacent sky in order to combine the new data with last year’s adjacent Heart Nebula to form a mosaic of both objects.  I don’t know why but this was my first attempt at a mosaic.  Only very recently has integrated software for mosaic planning combining  Cartes de Ciel and Astrophotography Tool for image capture has been released.  However, on this occasion I planned and implemented the said mosaic imaging manually, with a satisfying outcome (see Favourite Images section) but with the new software now available I hope to embark on more extensive mosaic projects in the near future.

This year’s astrophotography has followed two themes, the aforementioned ‘less is more’ with the aim of producing better images using much greater integration times.  The second has been largely determined by chance, being the discovery of new objects that had hitherto either been unknown to me or considered to be out of view from Fairvale Observatory; the combination of my house, very high hedges + trees and adjacent houses obscures large swathes of the night sky.  Earlier in the year such chance had led me to the M101 and M51 galaxies and in the autumn it was first the iconic Pacman Nebula and then an exciting area of Cygnus constellation.

Pacman is not particularly large for my equipment but nevertheless produced a decent narrowband image, my last from the Shed Observatory for this year.  Not until late September did the clouds again relent for my next project that initially seemed something of a long shot but actually turned out very well.  The Propeller Nebula is located in a vast HII region of the Cygnus Constellation, which from my point-of-view was a complete surprise.  At some 25 arc seconds the nebula is again on the small side for my equipment but the complexity of the adjacent HII region transforms the wider image into something really spectacular (SHO version below), which I certainly intend to visit again next year to build on the current data and explore further afield the HII region which presents exciting possibilities.

SHO F HLVG (Large)

A subsequent long trip to the USA stopped all astronomy in Surrey but a couple of evenings out in Wyoming and Utah produced some incredible dark skies and DSLR Milky Way images (see below).  Despite the remoteness of Spilt Mountain in the UTAH section of the Dinosaur National Monument – designated a Dark Sky Area – whilst imaging at 20 second exposures only one-in-ten images were without a plane track, very sad.

IMG_2345 ComboX

OCTOBER TO DECEMBER

Prior to the arrival of Orion and other fun objects of the mid-winter night skies, imaging opportunities are sparse with my equipment but it’s been a couple of years since I last imaged M31 the Andromeda Galaxy and therefore for two evenings in late October it was time to give our neighbour the extended integration treatment.  At 7½ hours data acquisition went well but although the processed image is probably my best yet of this object, there’s room for improvement, which I suspect will require a move to more advanced processing software?

HaLRGBx5b (Large)

ASTROMINAGING RECORD 2019

No Date Type Object Name
       
1 21/01/19 DSLR Full Lunar Eclipse  
       
2 27/01/19* NB  Barnard-33 &

 NGC 2024

Horsehead & Flame Nebula
       
3 23/02/19* Combo M42 Great Orion Nebula
       
4 25/02/19* Combo M78 Reflection Nebula Orion
       
5 12/03/19 BB NGC443/444 Jellyfish Nebula
       
6 24/03/19 Combo M95/96/105 Leo-1 Group
       
7 29/03/19* Combo M101 Pinwheel Galaxy
       
8 10/04/19 Combo M51 Whirlpool Galaxy
       
9 13/04/19 BB M81 & m82 Bodes & Cigar Galaxies
       
10 16/07/19 DSLR Partial Lunar Eclipse  
       
11 02/08/19 NB NGC 7380 Wizzard Nebula
       
12 23/08/19* BB IC 1848 Soul Nebula +

Mosaic Link

       
13 26/08/19 NB NGC 281 PacMan Nebula
       
14 05/09/19* NB DWB 111 Propeller Nebula
       
15 Sept DSLR Milky Way Split Mountain Utah
       
16 22/10/19* Combo M31 Andromeda Galaxy
       
17 18/11/19 BB M74 Galaxy
       
18 18/11/18 NB SH2-240 Spaghetti Nebula
       

*multiple evenings        Combo = HaLRGB       Underlined = BAA published

POSTSCRIPT

The ones that got away – imaged but not seen in WTSM this year – warts and all

RHB_2ajelly (Medium)

I saw some wonderful narrowband versions of the supernova remnant IC 443 Jellyfish Nebula this year, in particular adopting a wider view to incoporate its sentinel-like parner stars Tejat (Mu Geminorum) left and the tripple star Propus (Eta Geminorum) right, together with the reflection nebula IC 444 in the background.  As an experiment I think it may hold promise but will require a lot more integration time to improve the quality, colour and bring out more of IC 444.

M95_96_105 (Medium)

I’ve tried the Leo-1 group (M95/96/105) before but, as they say, if you don’t succeed try again.  Unfortunately the passage of time didn’t help – I need a larger telescope to do these critters justice! 

IMG_2336 (Large)

Dinosaur National Monument – Split Mountain, Utah.  Even at this wonderfully remote location, which is one of the darkest places in the USA, passing planes still get in the way of a good image – just like at Fairvale Observatory

M74 LRGBx (Medium)

At <=10 arc minutes the spiral galaxy M74 is too much for my equipment.

SH2-240 AB combined Ha Stretch (Large)

Located between the constellations Auriga and Gemini, SH2-240, Simeis 147 AKA the Spaghetti Nebula is a very large (+3 degrees) supernova remnant but it’s very low brightness makes imaging extremely difficult.  In fact prior to and during capture in Ha-wavelength, I had no idea if it was even within the image frame.  Aggressive stretching shows that it was there but only much darker skies and probably longer exposure time is likely to produce a more viable picture. 

 

The Sum Of The Parts

Picture saved with settings embedded.

Having established an alternative imaging site at the southern end of my garden in the summer of 2018 AKA The Shed Observatory, I was thrilled to be able to image objects in the north sky for the first time, hitherto obscured by my house from the usual observing location.  Soon thereafter it was with great pleasure I achieved a good narrowband image of IC 1805 the Heart Nebula but was subsequently disappointed to find that part of the neighbouring object, IC 1848 the Soul Nebula, had been missed after encountering a framing problem.

One year on I was back in The Shed with new objectives for these targets: (i) to obtain a complete image of the Soul Nebula, and (ii) given the relative proximity of the Heart & Soul Nebula, to compile a mosaic which included the two objects; surprisingly I’d not attempted a mosaic before and this seemed like a good place to start.  Given the increased imaging time needed to complete even a small mosaic + the lack of darkness at the end of August + British Weather, I chose to restrict imaging to just the Ha-wavelength, which works well with both these targets and could build on the Ha subs already obtained of the Heart Nebula in 2018.

Traditionally mosaic images are based on a grid of say 1+1, 1+1+1, 2 x 2, 3 x 3  etc., which are then combined using the relevant aforesaid sequences, however, in this case starting with the original Heart Ha-subs such a system was not possible.  Since moving to mono imaging with the ZWO ASI1600-Cool camera I’ve used the excellent APT (Astro Photography) image capture software, which hitherto has catered very well with all my needs – including plate solving.  However, at this time APT did not yet have a comprehensive mosaic facility (see footnote) which would allow an imaging grid to be planned and pre-programmed.  Instead it was therefore necessary to first determine suitable image coordinates for each mosaic panel that would cover the Heart & Soul + 25% overlap and then manually establish each position prior to imaging.

Given the proximity of each component I estimated a suitable mosaic could be achieved with three panels, one for each of the main objects and an intermediate panel that would bridge the space between, thus linking the objects to form a continuous mosaic.  Given the spatial relationship, each ofthe three panes needed to be stepped relative to each other and also slightly rotated.  The final data for each nebula consisted of 1h 40m integration time + a further 1h 15m for the link panel, or 4h 35m in total for the complete mosaic.

To my relief the final mosaic was relatively easy to create.  First modestly stretching each panel, paying attention to the background levels and removing any gradients, in order to ensure uniformity between the images before compilation.  I then used Microsoft’s free ICE (Image Composite Editor) software to stich the three panels together into a final mosaic, after which further adjustments were made in Photoshop.

I’m very pleased with the outcome of my first, albeit modest mosaic.  With the ability to return to targets on any occasion using plate solving and, as always weather permitting, multi-image mosaics now open up whole new possibilities which can be captured and compiled over a period of time – even years.  However, until I am able to use a suitable mosaic programme for sequencing, I’m more likely to restrict such projects to small areas that only require limited imaging time, such as the Heart & Soul.

The Greeks and Romans knew a thing or two about mosaics and I’ve long enjoyed Escher’s use of the mosaic form as a basis for his graphic art (see above).  I’m quite sure they would marvel at the astrophotography of Deep Sky Objects and how mosaics can be used in their creation.  The mosaic is all about the sum of the parts, which not only produces a wider, more encompassing view but in doing, so the combined parts add a different quality to the final image.  For now my first mosaic has been quite successful, was good fun and moreover, I can see that the technique ultimately has the potential to open up new and exciting possibilities even with my existing equipment.

Footnote: Since imaging and processing the Heart & Soul mosaic, a recently updated Cartes du Ciel (CdC) verson 4.2 has been released, which incorporates a mosaic planning function.  Moreover, the aforesaid plan can then be imported into the APT software (subject to a minor adjustment being undertaken by APT to fix a panel numbering issue) and thereby provide integrated mosaic planning and programming.   

IMAGING DETAILS – 2018
Object Heart Nebula IC 1805     
Constellation Cassiopeia
Distance 7,500 light-years
Size 150’ x 150’  =  2.5o or 200 light-years
Apparent Magnitude +18.3
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 guide camera & PHD2 control
Camera ZWO1600MM-Cool (mono)   CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PS2,  Deep Sky Stacker & Photoshop CS2, HLVG
Image Location              & Orientation Centre  RA 02:33:09    DEC 61:24:23                     

 

Exposures Heart Nebula 20 x 300 sec Ha  =  100 minutes   
  @ 139 Gain   21  Offset @ -20oC    
Calibration 5 x 300 sec Darks  20 x 1/4000 sec Bias  10 x Flats Ha  @ ADU 25,000  
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5
Date & Time 16th & 17th  August 2018 @ +23.30h  
Weather Approx. 12oC   RH <=95%

 

IMAGING DETAILS – 2019
Object Soul Nebula IC 1848   & Link Pane
Constellation Cassiopeia
Distance 6,500 light-years
Size 150’ x 75’  or 100 light-years
Apparent Magnitude +18.3
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 guide camera & PHD2 control
Camera ZWO1600MM-Cool (mono)   CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PS2,  Deep Sky Stacker & Photoshop CS2, HLVG
Image Location              & Orientation Centre – Soul Nebula   RA 02:56:16    DEC 60:20:07

Centre – Link Pane         RA 02:43:38    DEC 60:55:59    

Exposures Soul Nebula  20 x 300 sec Ha  = 100 mins   

Link Pane       15 x 300 sec Ha  =  75 mins

  @ 139 Gain   21  Offset @ -20oC    
Calibration 5 x 300 sec Darks  20 x 1/4000 sec Bias  10 x Flats HaI  @ ADU 25,000  
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5
Date & Time 23rd & 25th August 2019 @ +23.30h 
Weather Approx. 18oC   RH <=60%

 

Fabric Of Reality

DWB 111 Ha Combined FINAL Image (Large)

In a quest to find and image new targets, my curiosity was recently drawn towards a more obscure catalogue of HII emission nebula, in particular DWB 111, AKA Simeis 57 or The Propellor Nebula.  The object was first catalogued in the early 1950s by the Crimean Astronomical Observatory at Simeiz, Ukraine as number 57 of a total of 306 HII regions!  Then in 1969 H.R. Dickel, H. Wendker and J. H. Bieritz (DWB) developed a catalogue of 193 HII optically visible HII objects in the Cygnus-X region of the Cygnus constellation, which included DWB 111; strictly speaking The Propellor consists of DWB 111 & 119 with other close-by features DWB 107,108, 118, 125 & 126.

Whatever the nomenclature, suitable catalogues that can be used with Cartes du Ciel for the purpose of locating DWB 111 were difficult to unearth but I eventually found and installed the necessary data.  Shortly thereafter on 5th September, for the first time I successfully directed my telescope to this hitherto unseen and to some extent neglected part of the night sky. Wow!

DWB Catalogue

The target is located between Vega and Deneb, which at this time of the year tracks northwest directly above Fairvale Observatory and means the imaging opportunity is confined to just about 2 hours before disappearing behind the roof of my house!  As an HII region and with limited time, I therefore concentrated on imaging the Ha wavelength, with only a few SII and OIII subs, which are both weak in nature.  The aptly named Propellor Nebula lit up my initial test exposure at the centre of the screen and was obviously going to make an excellent object with more subs.  However, with a total Ha-integration time over two nights of some 110 minutes of Ha data, it was the details seen in surrounding region that took my breath away once processed (see top-of-page).

With a 2.65o x 2.0o field-of-view, my equipment provides a good view of The Propellor Nebula but stretching the Ha image stack revealed the aforementioned wider area, which is absolutely full of HII features that obviously continue well beyond the image.  Pointing to unseen forces, numerous filament-like threads produce fascinating structures that run throughout the nebulosity, which makes for a truly exciting image. With limited OIII and SII subs, colours were difficult to tease out using the HST palette but, nonetheless, the SHO (below) and HSO (bottom-of-page) images are also pleasing and hold much promise when additional integration time can eventually be obtained in the future.

SHO F HLVG (Large)

Unfortunately it seems that little is known about DWB 111, including its distance from earth and it is therefore difficult to estimate that actual size of the aforesaid view. Notwithstanding, it is clearly very extensive with exquisite details that seem to represent something of the very elusive fabric of reality that is space itself and it is therefore difficult to understand why DWB 111 and this exciting region of the night sky is not given more attention by astronomers.  Rich pickings abound and I hope to return one day to do this exciting area greater justice.

HSO F crop (Large)

IMAGING DETAILS
Object DWB 111,  Simeis 57  AKA  The Propellor Nebula 
Constellation Cygnus
Distance ?
Size <=25’  
Apparent Magnitude ?
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 20:16:78      DEC 43:23:33                     

Top = North     

Exposures 22 x 300 sec  Ha, 8 x 300 sec OIII & SII                                                                          (Total time: 3hr 10 minutes)   
  @ 139 Gain   21  Offset @ -20oC    
Calibration 5 x 300 sec Ha, OIII & SII  Darks,  20 x 1/4000 sec Bias  10 x  Ha, OIII & SII Flats               @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 5th & 7th September @ +22.30h  
Weather Approx. 16oC   RH <=75%                  🌙 ¼ waxing

 

Game On

NGC 281 SHOxxxCrop (Large)

Once again this year between April and August I moved to the so-called Fairvale Observatory South, AKA the “Shed Observatory” situated at the end of the garden, in order to provide imaging opportunities of the northern sky, which is otherwise completely blocked from view by my house from the north position.  It’s not perfect but I was able to tease out some new classic objects, as well as revisit others seen from here for the first time last year.  Despite having a view of Polaris from this location, I’d previously battled with guiding on circumpolar tracking objects and this year decided to grasp the nettle and address the problem.

Given prior success with the PHD Drift Align technique for polar alignment without a view of Polaris, as from Fairvale Observatory North, this time I decided to try the alternative PHD Polar Drift Alignment (PDA) method, which is based on direct visual alignment with Polaris.  However, although quite straight forward, after a number of attempts I still failed to achieve a decent result using this approach.  By this time astronomical darkness had ceased for more than eight weeks over the summer solstice period and I took a break from astronomy to ponder a solution.

Developed by an enthusiast in the UK, Sharpcap is a fully working, free image capture software.  However, for the sum of £10 the Pro-version contains a number of useful additional features, including a polar alignment routine that is highly recommended by numerous users on the Stargazers Lounge Forum – after spending my £10 I can see why.  There are similarities with PHD’s PDA method but Sharpcap is even easier to use and, more importantly, very soon I achieved a reasonable polar alignment from the Shed Observatory  for the first time!

Perhaps the surprising theme of 2019 has been the discovery of various classic objects that could, despite previous expectations to the contrary, be seen for imaging from Fairvale Observatory, albeit with some difficulties at times: M101 Pinwheel Galaxy & M51 Whirlpool Galaxy.  Now this summer this theme was about to continue, with the first cab off the rank being NGC 7380, AKA the Wizzard Nebula in the Constellation of Cepheus.

The Wizzard is an attractive emission nebula that forms a popular narrowband object for astrophotographers, frankly I was astonished to find it was within my sight from the Shed Observatory but not for long.  With astronomical darkness lasting only 3-hours at the beginning of August, starting at about 23.30h there was no more 2-hours for imaging before the target disappeared behind my +15ft hedge

NGC7380 Ha Stack2 Crop (Large)

Notwithstanding, I was keen to see how this relatively small object (25 arc minutes) would look with my equipment.  As so often, the stronger Ha-wavelength produced a half reasonable result (see above) with only 45-minutes (15×3 minutes) integration time but with only about 30-minutes (10×3 minutes) each, incorporating the weaker OIII and SII wavelengths only produced rather noisy and washed out HST images (below left SHO, right HOO).  However, I would be confident that with longer integration times, on another day from a better location, my equipment could probably do justice to the Wizzard.

As the Cygnus constellation then came into view three weeks later, I discovered another favourite object NGC 281 AKA the Pacman Nebula.  By now astronomical darkness had improved slightly, thus providing a 50% increase of integration time of nearly 3-hours! Though still somewhat limited in time, Pacman is however a little larger than the Wizzard (35 v 25 arc minutes), slightly brighter, with overall stronger narrowband, thus altogether providing a better imaging prospect.  The resulting HST images of Pacman therefore did not disappoint in SHO (top-of-the-page) and HaOO (below).

NGC 281 HOOgxXCropSpike.png

Whilst imaging from the Shed Observatory has resulted in a number of imaging firsts and proved a lot of fun over the last two summers, I’m now of the opinion that I to further improve my field-of-view and imaging times looking north I need to move away from the Shed and into the garden, as was originally planned; the +15ft hedges adjacent to the Shed location frequently curtails sight lines and a move slightly north could add up to 2-hours imaging time – we shall see.  Furthermore, the discovery of Sharpcap and its Polar Alignment function is certainly a game changer, that I hope to put to good use again next year when I move into the garden for the summer.

IMAGING DETAILS
Object NGC 281  AKA Pacman Nebula
Constellation Cassiopeia
Distance 9,500 light-years
Size 35 arc minutes 
Apparent Magnitude +7.4
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 00:55:00      DEC 56:40:29                     

Right = North  

Exposures Ha 15 x 300 sec  OIII & SII 10×300 sec                                                               (Total time: 2hr 55 minutes)
  @ 139 Gain   21  Offset @ -20oC    
Calibration 5×300 sec Darks 20 x 1/4000 sec Bias 10 x  Ha, OIII & SII  Flats  @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 26th August 2019 @ +22.15h  
Weather Approx. 19oC   RH 70%                  🌙 Crescent waning

Fireworks

 

HaLRGB final-denoise2-denoise-PS (Large)

At Fairvale Observatory North it’s normal that I struggle to find suitable objects when the so-called Galaxy Season arrives in late winter through spring.  Despite the abundance of galaxies my William Optics 81mm aperture rules out all but a few for imaging as they are mostly just too small.  However, smaller galaxies that make up features such as Markarian’s Chain and the Leo group do produce a pleasing widefield image full of the so-called faint-fuzzies but hitherto with the exception of M31 the Andromeda galaxy I’ve struggled to obtain the real thing – a decent, full-on spiral galaxy – they are there of course but are either obscured to the north by my house and trees or, as indicated, are too small for my equipment to resolve properly.

LRGB.png

M95_96 Anotated

Nonetheless, this year after playing around imaging the aforesaid Leo Group (see above), I looked directly above the observatory and to my surprise discovered a new world of galaxies close to the Zenith that were just visible, briefly transiting along the southern edge of the house roof, which included a few large classics in-and-around the constellation Ursa Major.  After 2-hours imaging the Leo group time was too short for a serious attempt at any of these galaxies but nonetheless was sufficient to experiment with what looked like a potential target, the wonderful M101 the Pinwheel Galaxy, which at over 28 arc seconds showed real potential with only 42 minutes of subs before it disappeared out of sight for the night.  Moreover, large parts of Ursa Major and nearby galaxies also briefly appeared at other times on the night from behind the roof, tracking close to the gutter for nearly 2.5 hours before returning behind the roof in a similar manner to M101.  Thus assuming full set-up could be achieved earlier in the evening, this seemed to provide a window of opportunity that I grasped over two subsequent evenings with a very satisfactory outcome.

With nearly 5-hours of subs, processing of M101 would be a challenge in order to bring out the galaxy’s colours and perhaps highlight the stellar nursery areas that are found along the spiral arms and are rich in Ha-light.  To do this I first changed the RGB image stack to Lab Colour in Photoshop, increased the saturation in the (a) and (b) channels before returning to RGB mode.  This had the desired effect of successfully enhancing the colours, which can otherwise look washed-out after stacking, stretching and combining.  After this I split the RGB channels and pasted the Ha-stack into the Red channel, before re-combining again into an RGB image, at which point the H II regions along the spiral arms just lit up!  These were both new processing techniques for me that greatly improved the final image and hold great promise for processing HaLRGB objects in the future.

M101 closeup data crop

M101 widefield data crop

The final image (top of the page + crop below) far exceeded my expectations in detail and colour, showing off much of the galaxy’s wonderful structure and the aforementioned HII regions. There’s no doubt that further integration time will benefit the faint extremities of the galaxy but for now it was a very satisfying outcome of a spectacular object that hitherto I thought was beyond my seeing at Fairvale Observatory.  Also noteworthy, the image has caught a plethora of companion galaxies close to and around M101 (see annotated images above), most conspicuous of which is the classic side-view of NGC 5422 (left of M101) and the more unusual dwarf spiral galaxy NGC 5474 (right of M101),  which has been noticeably distorted by gravitational interaction with the Pinwheel itself.  All-in-all a fine display of galactic fireworks worthy of November 5th.

M101 HaLRGB crop-denoise-denoisePS

 

IMAGING DETAILS
Object M101  Pinwheel galaxy
Constellation Ursa Major
Distance 20.9 million light-years
Size 28.8’ x  26.9’  or 170,000 light-years  
Apparent Magnitude +7.86
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 14:03:15      DEC 54:20:46                     

Top = North  

Exposures (A)    L 31 x 180 sec  HaRGB each 16×180 sec                                                                  (Total time:4hr 45 minutes)   
  @ 139 Gain   21  Offset @ -20oC    
Calibration 10 x 180 sec & 15 x 60 sec Darks  20 x 1/4000 sec Bias  10 x  HaLRGB Flats               @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 29th & 31st March 2019  @ +22.00h  
Weather Approx. 8oC   RH <=70%                  🌙  ¼ waning

 

Hunting Orion

Combined +180 degrees 3+5min HaLRGB (Large)

In Greek mythology it is said that Zeus, the god of thunder, placed a giant huntsman amongst the stars as the constellation Orion.  Today it is one of the most recognizable of the 88 constellations in the night sky and certainly one of the most popular amongst astronomers.  Towards its extremities it is defined by the red supergiant star Betelgeuse at the top-left and the massive blue supergiant Rigel lower-right, divided in the centre by Orion’s so-called ‘belt’ formed by the line of bright stars from left-to-right: Alnitak, Alnilam and Mintaka.  These and the other stars that make up the constellation of Orion are of great interest to astronomers and also make an attractive widefield image with a standard camera.  But the more serious astrophotographer is mainly interested in the panoply of exciting DSOs that lie within and around Orion that I have therefore been pursuing myself since late January.

My quarry started with the Horsehead and Flame nebulae imaged in narrowband processed using the Hubble Palette technique in SHO to great effect.  Much to my surprise a spectacular period of warm weather and clear skies four weeks later then allowed me to capture the Great Orion Nebula over three nights in HaLRGB with an equally good result.  Such was the fine weather conditions that I was then able to continue over a further two nights – five consecutive nights of imaging in the UK in late February, unprecedented in my experience – with the objective now being the reflection nebula M78.

M78 is the brightest diffuse reflection nebula of a group that belongs to the Orion B molecular cloud complex but with an apparent size of 8 x 6 arc seconds it is a something of a challenging target with my equipment.  Notwithstanding, with the mono CMOS ZWO camera and the opportunity of obtaining increased integration times I considered it worth a try and was not disappointed with the outcome.

I generally like to present images in their natural orientation but this time I’ve chosen to rotate the it 90o anticlockwise, thus allowing the wider horizontal framing to better show M78 and the dramatic red Ha-light of nearby Barnard’s Loop together.   As with M42 previously, I first stacked and processed two exposure sets, short 60 second and long 300 second subs, before then combining them so as to tease out subtleties within the reflection nebula itself and provide greater control of the otherwise dominant Barnard’s Loop.  Despite my concerns about equipment and scale, I’m very pleased with the outcome of the main image (top-of-the-page), which beautifully shows off both the aforementioned objects to great effect and has even extracted some of the colour and detail of associated star clusters within and around the nebula.  Not surprisingly the cropped version of M78 itself starts to look a little noisy but is nonetheless interesting (below).

Combined crop 3+5min HaLRGB (Large)

After a very unpromising few months, the weather, Orion and my astroimaging took a surprising turn for the better from the end of January.  As a result of much longer integration times using plate solving over multiple sessions, combined with varied exposure times and more complex processing, I successfully managed to bag three classic deep sky objects of the Orion constellation – what’s not to like?

IMAGING DETAILS
Object M78 Orion reflection nebula
Constellation Orion
Distance 1,350 light-years
Size 8’ x 6’   
Apparent Magnitude +8.3
 
Scope  William Optics GT81 + Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 05:47:37      DEC 00:20:59                     

Top Left = North  Bottom Left = East 

Exposures (A)    LRGB 8 x 180 sec  Ha 10 x 180sec       (Total time: 1hr 24 min.)

(B)    HaLRG 12 x 300 sec B 17 x300 sec      (Total time: 5hr 25 min.)   

  @ 139 Gain   21  Offset @ -20oC    
Calibration 10 x 180 sec & 5 x 300 sec Darks  20 x 1/4000 sec Bias  10 x  HaLRGB Flats               @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 25th  26th 27th February  2019 @ +19.45h  
Weather Approx. 8oC   RH 60 to 80%                  🌙  ½ waning

Eleventh Hour

HaLRGB2FINALcrop (Large)

As outlined in my last post Horseplay, it seemed like plans for imaging over the winter were going to be completely scuppered this year, with weeks of cloud cover from mid-November through to late January.  I was therefore very grateful for three clear nights at the end of January that finally enabled me to carry out my principal winter imaging project of the Horsehead and Flame nebulae in narrowband.  Notwithstanding, given the preceding bad weather and the onset of galaxy season, I reckoned that this was likely to be the end of my imaging for a while, which could not have been further from the truth as more than two months of good night skies (on-and-off) then followed.

Although by late February Orion is crossing the Meridian early in the evening, darkness is still prevalent at the same time and with the aforementioned good conditions it’s been a bonus to catch more of Orion’s objects before they finally disappear for the year.  I’ve successfully imaged some parts of Orion before with the ZWO1600MM-Cool camera but for various reasons they’ve mostly been short integration times in narrowband.  It was therefore obvious that given this unexpected opportunity, on this occasion I should attempt to image everyone’s astrophotography favourite – M42 the Orion Nebula in LRGB.

At some 1,500 light years distance, M42 is the closest large star forming nebula to Earth and always holds great promise when imaging.  I’d previously obtained some good images of the Orion Nebula with a modded-DSLR camera and more recently a few narrowband images in 2017 showed the promise of using the new ZWO CMOS mono camera.  Now with unusually good weather I wanted to try and achieve an image that really showed off M42 and its neighbours M43 and the Running Man Nebula (SH-279) in all their glory, paying particular attention to the more difficult inner structures and associated Ha nebulosity.  In order to achieve this I first imaged in HaLRGB at 180 sec exposures with Unity settings for 5½ hours and then at shorter 60 sec exposures for 1 hour over three consecutive nights.

With much longer integration times than before, careful processing and manipulation to bring the long and short exposure images together, I’m very happy with the final result, which I believe achieves most of the aforementioned objectives.  Internal structure and colour is shown to good effect but I’m especially pleased with the addition of the Ha data, which dramatically enhances those areas where present together with interstellar dust within and around the main objects; I’m already planning to add more Ha data next year to further intensify the aforesaid impact.

M42 180s Ha StretchNR (Large)

M42 Ha data

Obtaining such results at this late stage of February was completely unexpected and, I thought, would effectively mark the eleventh hour this year for Orion and the rich collection of other DSOs that are found across the winter sky.  But no, there was much more to come – watch this space!

IMAGING DETAILS
Object M42 Orion Nebula + M43 & Running Man Nebula (SH2-279) etc.
Constellation Orion
Distance 1,500 light-years
Size 65’ x 60’  or 24 light-years (M42 only)
Apparent Magnitude +4.0
 
Scope  William Optics GT81 + 0.80 x Focal Reducer FL 382mm  f4.72
Mount SW AZ-EQ6 GT + EQASCOM computer control & Cartes du Ciel
Guiding William Optics 50mm guide scope
  + Starlight Xpress Lodestar X2 camera & PHD2 guiding
Camera ZWO1600MM-Cool mono  CMOS sensor
  FOV 2.65o x 2.0o Resolution 2.05”/pix  Max. image size 4,656 x 3,520 pix   
EFW ZWOx8 + ZWO LRGB & Ha OIII SII 7nm filters 
Capture & Processing Astro Photography Tool + PHD2 +  Deep Sky Stacker & Photoshop CS3
Image Location              & Orientation Centre  RA 05:35:09      DEC -05:08:31                     

Top Right = North   Top  = North East   Bottom Left = South   Bottom = South West 

Exposures (A)    L 20 x 180 sec  R 24×180 sec  G 25 x 180  B  24 x 180sec  Ha 17 x 180sec                            (Total time: 5hr 30 minutes)

(B)    12 x 60 sec HaLRGB (Total time: 1hr)   

  @ 139 Gain   21  Offset @ -20oC    
Calibration 10 x 180 sec & 15 x 60 sec Darks  20 x 1/4000 sec Bias  10 x  HaLRGB Flats               @ ADU 25,000
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5-6
Date & Time 23rd 24th 25th February  August 2019 @ +19.40h  
Weather Approx. 7oC   RH <=75%                  🌙 ¾ to ½ waning

Howling Wolf

lunar eclipse mosaic 210119x

I have a theory that at or about the time of each full moon the night sky is almost always clear, I don’t have the data but it just seems that way most of the time.  As an astrophotographer I am more than usually aware of the full moon as it makes all except narrowband imaging impossible, when it floods the night sky with its brilliant white light.  Apart from a brief and somewhat futile attempt on 14th December – the Moon and mixed cloud curtailed imaging on that occasion – my last astronomy at Fairvale Observatory was on the 17th October, thereafter being plagued by persistent cloud and bad weather; after a promising start at Les Granges Observatory in early November no further astronomy was possible during the rest of the week due to cloud and poor weather conditions.  I’m beginning to think I need a new hobby, one that is not weather dependent at least!

Given the disappointing lack of astronomy conditions I paid little attention to the upcoming lunar eclipse on the early morning of 21st January.  However, as the day approached various weather forecasts were inevitably mixed but at least two out of five held some promise of clear skies during part of the eclipse.  I therefore started to at least undertake some preliminary planning, only to discover that much of the eclipse might be obscured by houses and tall trees to the west of my location; Plan-B was to travel to nearby Reigate Priory Park which has a decent westerly outlook closer to the horizon.

As it turned out on the 20th a clear, sunny but cold and clear day preceded a clear evening and at about 3 a.m. on the 21st shortly before the action was due to start, the sky was still clear, thankfully proving my theory correct on this occasion.  Furthermore, my concerns over obscured views turned out to be mostly unfounded, with the Moon higher in the sky than envisaged and good sightlines up until the end of totality, at which time the cloud eventually rolled in anyway.  As a result I was able to enjoy over two hours viewing and imaging time, which encompassed the entire penumbral and totality stages of the eclipse.

Having obtained excellent images of the last lunar eclipse on 28th September 2015, tracking with a DSRL and the William Optics GT81 + another static, tripod fitted DSLR and 250mm zoom lens, this time I decided to adopt a different, more mobile set-up, in case Plan-B was necessary.  In 2017 I purchased a Canon 300mm f/4 L-Series telephoto lens to use for astronomy and wildlife photography.  The Canon’s Series-L lenses are a high quality, professional line especially made for APS-C cameras such as the 700D.  With no less than 15 lens elements and a fixed focal length, the picture quality for terrestrial imaging is fantastic, further assisted by a very accurate and quite image stabilizer.

This time I mounted the lens directly onto the tripod, with the camera further back so as to provide good balance between the two components.  As the autofocus and IS functions cannot be used in a dark sky for astrophotography, focus can be tricky and a compromise is required between the aperture setting for sharpness and a low ISO for quality.  As I discovered last time, the light quality diminishes significantly whilst the eclipse progresses across the face of the Moon and the aforesaid settings need to be constantly adjusted to compensate, especially during totality.  In the end I was pleased with the outcome of imaging the so-called Super Blood Wolf Moon (see mosaic above and image below).

img_1235x

As pleasing as imaging the eclipse is, like a solar eclipse viewing is an entirely different experience.  It is a pleasure to just watch the whole phenomena play out but the dramatic changes of light also has a profound effect on both the night sky itself and, in particular, the very nature of the Moon as perceived by the naked eye. On a clear night the full moon floods the night sky with its very bright light, thereby effectively hiding all but the very brightest of stars from view.  As the penumbral stage progresses (see diagram below) for about an hour the dark night sky is slowly revealed in all its glory, it’s as if someone has pulled the curtains and a new world has appeared.

total-lunar-eclipse-jan-2019-plot

Furthermore, as the moon darkens and eventually enters totality it takes on a completely different and eerie feeling, as well as a red hue caused by Raleigh scattering.  As is often the case with astrophotography the camera sensor is able to capture much greater colour and detail than the naked eye can see, thus producing beautiful images of one of nature’s best shows.  However, to the naked eye the moon takes on a different, somewhat strange nature during totality – something of a 3D effect occurs as it seems to float in the night sky like a big red balloon – something that an image cannot ever capture, making the night time adventure more exciting and worth all the effort.

Lunar eclipses are not that rare but we now have to wait 10-years for the next one in the UK which will take place on 20th December 2029, with or without cloud!

IMAGING DETAILS
Object Lunar eclipse – Super Blood Wolf Moon
Distance <238,000 miles (30,000 miles closer than usual)
Size 31’or 1/2o  
Apparent Magnitude -12.74  @ mean full moon
 
Scope / Lens  Canon L-Series 300mm f/4
Mount Manfrotto tripod
Camera Canon 700D  
Capture & Processing Manual, Photoshop CS3- Extended
Exposures x50:  Penumbral f/8   1/125’   ISO 100     Totality f/5.6  0.80’   ISO 400    
    
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5
Date & Time 21st January 2019 @ approx. 03.30h  
Weather <= 1oC   RH <=95%                  🌙   Eclipse