Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  27 gam Cas  ·  IC 59  ·  IC 63  ·  IC59  ·  IC63  ·  Sh2-185  ·  The star Navi (γCas)  ·  gamma Cas nebula
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IC63 & IC59 - The Ghosts of γCas, 


            Vincent Savioz
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IC63 & IC59 - The Ghosts of γCas

Imaging telescopes or lenses: TS-Optics TS 100 Quadruplet

Imaging cameras: ZWO ASI1600MM-C

Mounts: SkyWatcher EQ6 PRO GOTO

Guiding telescopes or lenses: Orion 80/400

Guiding cameras: Orion Starshoot autoguider

Software: PHD Lab PhD 2 Guiding  ·  Pleyades Astrophoto PixInsight Ripley  ·  Main Sequence Software SGPro  ·  Sequence Generator Pro  ·  Photoshop

Filters: Astrodon OIII 3nm 36mm  ·  Astrodon Ha 3nm 36mm  ·  Astrodon SII 3nm 36mm

Accessory: PrimaLuceLab Sesto Senso focuser  ·  ScopeDome 3M  ·  ZWO Filterwheel EFW 7x 36mm

Dates:Nov. 11, 2020Nov. 14, 2020Nov. 16, 2020

Astrodon Ha 3nm 36mm: 80x300" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm 36mm: 50x300" (gain: 200.00) -20C bin 1x1
Astrodon SII 3nm 36mm: 50x300" (gain: 200.00) -20C bin 1x1

Integration: 15.0 hours

Darks: ~50

Flats: ~30

Bias: ~50

Avg. Moon age: 18.47 days

Avg. Moon phase: 7.52%

Bortle Dark-Sky Scale: 4.00

Temperature: 5.00

Astrometry.net job: 4015590

RA center: 1h 0' 13"

DEC center: +60° 46' 13"

Pixel scale: 1.345 arcsec/pixel

Orientation: -91.814 degrees

Field radius: 1.061 degrees

Resolution: 4539x3414

Locations: Home Observatory, Ayent, Valais, Switzerland

Data source: Own remote observatory

Remote source: Non-commercial independent facility


IC63 and IC59 are two diffuse nebulae in the constellation Cassiopeia at about 600 lightyears. These clouds are only 3 or 4 lightyears away from the bright star Gamma Cas. Its ultraviolet radiation is slowly dissipating them and ionize the surrounding gas, making it shine.

We often see these nebulae in HaLRGB, that’s why I decided to improve a little bit and make a SHO image! Actually, a few people did it before ^^. I was later surprised to see how much Sii there was in these clouds of glowing gas. In fact, there’s a strong signal near every edge of the nebula, which is translated as bright orange/yellow in this image. It’s not too obvious here because Ha is also strong in these regions. Oiii is almost inexistent. The artifacts around the bright star are not due to processing. It’s actually due to the ZWO ASI1600 glass in front of the sensor (from what I read on forums).

Overall, I’m happy with this image. Details are fine, and the noise kept under control. As always, advice and criticism are welcome!