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.
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.
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. |