IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars (Alastairmk)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 27 Cas) · IC 59 · IC 63 · The star Navi (γ Cas

IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars, Alastairmk

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IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

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IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

The Gamma Cassiopeia Nebula is very faint and close to 27 γ Cas (Navi) a very bright magnitude 2.2 star which can create nasty halos on long subframe exposures. Somewhat unusual, in my experience, is the very low OIII signal and similar strength Hα and SII signals. I could have cropped out Navi, which was a dear old friend for calibration in pre-observatory days, but decided to leave it in and keep most of the halo which balances the red of the main image. Processing the RGB stars, about an hour of 30sec exposures was a challenge to bring out the faint ones without bloating the bright stars. While I might process a more traditional SHO palette in a future revision, I rather like the fiery result, though this might not be to everyone's taste.

Subs were acquired over 12 nights during the period 2023-10-23 to 2023-11-13. All were 480s exposures at camera gain of 0 and sensor temperature -20ºC. My now standard practice is to capture lots and lots of subs, using a fairly automated backyard observatory, and weed out the worst with Blink, SubframeSelector and NormalizeScaleGradients. This left 311 HOS subs with a total integration time of 41.5 hours. Processing relied heavily on the RC-Astro AI processes and GeneralizedHyperbolicStretch, including for the RGB stars. Stars were color calibrated with SpectroPhotometricColorCalibration using the Gaia DR3/SP database. While the processing brings out contrast, color and some sharpening, this remains what I think is an inherently fuzzy object.

Light Polluted skies
NOVAC

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Status	Basic success
Started	...
Astrometry.net job	8806053
PixInsight job	n/a
PixInsight queue size	n/a
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IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

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IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

IC63 & IC59, Gamma Cassiopeia Nebula in HSO with RGB stars

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