SH2-204 - Bright (NOT!) Nebula in Camelopardalis (Fran D.)

Celestial hemisphere: Northern · Constellation: Camelopardalis (Cam) · Contains: HD237188 · HD237191 · HD237193 · HD237196 · HD237198 · HD237201 · HD237202 · HD237204 · HD24141 · HD24298 · HD24350 · HD24395 · HD24410 · HD24430 · HD24678 · HD24717 · HD24758 · HD24808 · HD24853 · HD25226 · LBN 689 · Sh2-204

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SH2-204 - Bright (NOT!) Nebula in Camelopardalis

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SH2-204 - Bright (NOT!) Nebula in Camelopardalis

SH2-204 (LBN 689) is cataloged as a bright nebula, but for an amateur imager, it is anything but bright! The nebula is a very dim SHO target, consisting mostly of Ha. Relative to Sii and Oiii, the Ha is the strongest emission line, making up the majority of the data recorded. Sii is very weak, overlaying the Ha gas, while the Oiii is even weaker, appearing to radiate from the lower (in my image) edges of the main nebula. SH2-204 appears to be a rarely imaged target, and based upon my experience trying to process it, perhaps this is why. I found less than 20 images of Sh2-204 on Astrobin. As the signal is very weak, noise is a big problem when trying to stretch the data. Even with almost 50 hours of data, this has been by far the most difficult nebula I have processed to date. I almost gave up several times, finally arriving with an image I felt was good enough to share.

Narrowband imaging
Central USA
ZWO ASI294MM Pro Images
Sharpless2 Objects
The refractors!
Cloudy Nights

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Status	Advanced success
Started	...
Astrometry.net job	8899732
PixInsight job	6G8FJCWP0ECRE4QPM913ZA0KU74N8NXC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h57m38s.253
RA (top/left)	03h56m58s.117
RA (top/right)	03h49m04s.905
RA (bottom/right)	03h58m16s.370
RA (bottom/left)	04h06m28s.644

Dec (center)	+57°31′12″.43
Dec (top/left)	+58°49′10″.56
Dec (top/right)	+56°55′34″.52
Dec (bottom/right)	+56°13′13″.99
Dec (bottom/left)	+58°04′39″.33

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SH2-204 - Bright (NOT!) Nebula in Camelopardalis

SH2-204 - Bright (NOT!) Nebula in Camelopardalis

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SH2-204 - Bright (NOT!) Nebula in Camelopardalis

SH2-204 - Bright (NOT!) Nebula in Camelopardalis

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