M81 and M82 (Alex Ranous)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's Galaxy · Cigar Galaxy · HD85161 · HD85458 · HD85533 · HD85828 · M 81 · M 82 · NGC 3031 · NGC 3034

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M81 and M82

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M81 and M82

I captured this data a few months ago, but I wasn't happy with my initial attempts at processing it. I tried to tease out that flux that all the cool kids are showing in their images, but I could never tease it out w/out a ton of noise. I think I need to give up on going for that really faint stuff given the realities of my local light pollution. I decided to just show what I have.

For this image I removed the stars from my lum and rgb. I separately stretched a dup of my RGB using ArcsinhStretch and a mild histogram stretch to preserve the star colors and used those stars in the final LRGBCombined image.

Original
Final
B

B

Description: Now with IFN! I've been seeing all these great m81/82 images with IFN, so I thought I'd circle back and hunt for it in my data. I reprocessed my lum and was a lot more careful with DBE and stretching. With some better masking and careful use of curves, I managed to tease it out of my data. I'm sure some GHS guru could have done it a lot easier, but I still haven't warmed to that tool. I'm still looking for a good tutorial. I also tweaked the the stars a bit by using the stars I yanked from from my lum as a lum for my RGB stars, which tightened them up a bit.

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Status	Advanced success
Started	...
Astrometry.net job	7302558
PixInsight job	IUDGJD7KAVZOWCN7TH3DIPLACKVFBO0R
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h55m44s.859
RA (top/left)	09h54m05s.945
RA (top/right)	09h47m04s.701
RA (bottom/right)	09h57m15s.286
RA (bottom/left)	10h04m48s.772

Dec (center)	+69°17′46″.53
Dec (top/left)	+70°12′11″.90
Dec (top/right)	+68°48′17″.29
Dec (bottom/right)	+68°23′17″.00
Dec (bottom/left)	+69°45′33″.31

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M81 and M82

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