Playing With Fire

RGB (Large)

When possible my current repertoire has continued with DSO targets previously imaged with a modded DSLR and now revisited using the ZWO1600MM-Cool camera.  In general I’ve found the outcome with the new camera has been noticeably better in detail and colour but I’m still learning and know I can do better in time.  Last imaged in December 2015 with a DSRL camera, the larger FOV comfortably encompassed both the Tadpole (IC410) and adjacent Flaming Star (IC405) nebulae, resulting in an exciting composition. However, this time the ZWO CMOS sensor could only accommodate the latter in the image but with improved resolution.

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Picture saved with settings embedded.

IC 405 (right) The Flaming Star Nebula & IC 410 The Tadpole Nebula: WO GT81 & modded Canon 550D + FF | 15 x 180 sec @ ISO 1,600 & full calibration | 8th December 2015

The Flaming Star is an emission / reflection nebula, which surrounds the bright blue variable star AE Aurigae.  Imaging in narrowband produced decent Ha data but was very weak in OIII and SII wavelengths and even with 2-hours integration time is somewhat lacking in colour both in SHO (top-of-the-page) & HOO (below).  Notwithstanding, it’s an exciting object that at some point in the future will obviously require much longer imaging time and perhaps even a mosaic  in order to include its neighbour the Tadpole once again.

HOO (Large)

FN

IMAGING DETAILS
Object The Flaming Star Nebula   IC405     
Constellation Auriga
Distance 1,500 light-years
Size 37’ x 19’  
Apparent Magnitude +6.0
 
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,  Deep Sky Stacker & Photoshop CS2
Exposures 300 sec x12 Ha, x6 SII & x6 OIII (Total time: 120 minutes)
  @ 139 Gain  21 Offset @ -20oC  
Calibration 5 x 300 sec Darks  20 x 1/4000 sec Bias  10 x Flats Ha, OIII & SII @ ADU 25,000  
Location & Darkness Fairvale Observatory – Redhill – Surrey – UK        Typically Bortle 5
Date & Time 24th February 2018 @ 20.30h approx.

 

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