Sh2-155, Cave Nebula, HαRRGB, 12 Sep 2014+28 Sep 2016 (David Dearden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Sh2-155

Sh2-155, Cave Nebula, HαRRGB, 12 Sep 2014+28 Sep 2016

Tried to add some OSC RGB to go with Hα from 2014, but the session failed due to image download issues a little after I went to bed. Hence, I didn't get as much data as I should have. I'm trying to learn how to add the RGB stars back into the HαRRGB to preserve some of their color and brightness without overwhelming the image. Still learning how to do that, but this is a current attempt, and it is dramatically better than my first attempt on this target in 2012 so I’m happy to see the progress.

Date: 28 Oct 2016

Subject: Sh2-155, Cave Nebula

Scope: AT8IN + Antares 0.5x focal reducer

Filter: Baader Planetarium UHC-S

Mount: EQ-6 (EQMOD)+PEC

Guiding: Orion ST80+Antares 0.5x focal reducer +DSI Ic+PHD 2.6.1.8 (Win 10 ASCOM)

Camera: DSI IIc, no chiller CCD ~10 °C

Acquisition: Sequence Generator Pro 2.5.1.15 with Nebulosity 4.1.1 ASCOM camera driver (Win 10)

Exposure: 14x600 s (OSC) + 11x600 s (Hα)

Stacking: Neb 4, bad pixel map, bias included, 33 flats, match histograms, trans+rot align, Neb 40-60%tile stack.

Processing: StarTools 1.4.305: Crop; Wipe; Develop: 79.19%; HDR

ptimize; Color:Scientific, 122% saturation; Deconvolute: 2.4 pix; Life:moderate; Track: Smoothness 87%, 4.5 pix; Magic, shrink 1 pix. Heal out stars per online StarTools tutorial and save. Photoshop CS6 + Astronomy Tools: Deep space noise reduction; Use HαR for R and for Luminance; boost R channel; Layer on RGB stars using Color Dodge; Increase star color; Levels; Hue/Saturation adjustments a couple of times; Layer masked local contrast enhance; Liquify/pucker; Astroframe.

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Status	Advanced success
Started	...
Astrometry.net job	1273720
PixInsight job	FZRB4M9GF8MFJUJ0MAILIZR7N7E03ZQP
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h57m31s.10
RA (top/left)	23h00m34s.14
RA (top/right)	22h54m28s.20
RA (bottom/right)	22h54m31s.77
RA (bottom/left)	23h00m30s.10

Dec (center)	+62°30′34″.2
Dec (top/left)	+62°46′24″.3
Dec (top/right)	+62°46′38″.7
Dec (bottom/right)	+62°14′35″.6
Dec (bottom/left)	+62°14′22″.10

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Sh2-155, Cave Nebula, HαRRGB, 12 Sep 2014+28 Sep 2016

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