SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha) (Bruce Donzanti)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: LBN 808 · PK173+02.1 · Sh2-235

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SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

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SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

Sh2-235 is a bright HII region, that is part of a larger complex consisting of SH2-231, 232, and 233 in the constellation Auriga. It is odd in that it contains much more SII than OIII. In fact, it contains very little OII; thus, I am presenting an unusual Ha:SII bicolor image. While that in itself is strange, I also made a couple of bad decisions which led this to be a very disappointing result. I challenged nature in that I thought I could image this object despite being only a few degrees away from the moon during evenings with very intense moon glow (80-99%). As a result, despite hours of pre- and postprocessing and having very good equipment, I struggled to get an image that displays the clarity and resolution I usually expect. So, between the close proximity of SH2-235 to the moon, my usual LP sky, and a couple of nights with below average seeing (although most of the evenings seeing was average or above to avoid oversampling with my 0.28 arcsec/pixel setup), I learned that even NB imaging has its limitations. As a result, I had to eliminate over 10 hours of data as SII, in particular, was washed out. Despite all of this, I decided to post it anyway for three main reasons: 1) to remind me to revisit this beautiful site and re-image it under more favorable conditions, 2) not to be stupid again and repeat these errors and 3) you can at least see the wonderful interaction with Sh2-235 with its bigger companion in the lower left, Sh2-233.

Final
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C
D

D

Description: H-alpha version

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C11" EdgeHD

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Status	Advanced success
Started	...
Astrometry.net job	5420442
PixInsight job	ZOXVE9X7V8BYX1KWY03IDR8OFSMHLRK0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h41m01s.435
RA (top/left)	05h39m48s.296
RA (top/right)	05h39m57s.551
RA (bottom/right)	05h42m14s.221
RA (bottom/left)	05h42m05s.783

Dec (center)	+35°54′15″.82
Dec (top/left)	+36°11′18″.96
Dec (top/right)	+35°35′43″.32
Dec (bottom/right)	+35°37′06″.52
Dec (bottom/left)	+36°12′43″.21

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SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

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SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

SH2-235 (original showing interaction with Sh2-233; version C is Sh2-235 cropped; version D H-alpha)

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