Messier 4 (RGB) (Linda)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: HD147491 · HD147592 · HD147743 · M 4 · NGC 6121 · PGC 185272

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Messier 4 (RGB)

Link: https://lindasastronomyadventures.space/?p=11092

Powered byPixInsight

Messier 4 (RGB)

Link: https://lindasastronomyadventures.space/?p=11092

I started this near full moon but the sky was clear so decided to try my a star cluster. In this case it was M4. I think this is the farthest south I've imaged an object and it was low in the sky but I can't complain about the results especially since the universe didn't seem to want me to succeed.

About ⅔ of my red frames had satellite trails in the same place. This is despite being imaged on different nights. I ended up throwing a lot of red away because there were so many trails in the same spot that image rejection decided they were signal and not outliers.Strangely there wasn't a single trail in green or blue. Then when I went to process this after removing the problematic red, I somehow didn't notice that I omitted a bunch of green. I didn't notice until I was entering metadata here on astrobin. However, this was never intended to be a deep image and I didn't notice any problems when processing so I decided to go with it.

Processing was very simple:
dynamic crop
DBE
PCC
GHS (blend of RGB and color stretches)
Curves (contrast)

And that was it. I really like what GHS did with the cluster. And it was fun to spend a little time down in the muck to get an object that never rose high. Overall, I'm pretty happy with the final result!

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	5934236
PixInsight job	7Z085ZJ7TBY1G6C7NPNPOOAEME15GMRZ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h23m34s.423
RA (top/left)	16h21m22s.903
RA (top/right)	16h25m48s.137
RA (bottom/right)	16h25m44s.861
RA (bottom/left)	16h21m21s.395

Dec (center)	-26°29′51″.83
Dec (top/left)	-26°51′26″.60
Dec (top/right)	-26°50′36″.72
Dec (bottom/right)	-26°08′14″.15
Dec (bottom/left)	-26°09′02″.88

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Messier 4 (RGB)

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