M101 Hα-LRGB (Uwe Deutermann)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5447 · NGC 5449 · NGC 5450 · NGC 5451 · NGC 5453 · NGC 5455 · NGC 5457 · NGC 5461 · NGC 5462 · NGC 5471 · Pinwheel galaxy

M101 Hα-LRGB

I believe I will not live long enough to get an M101 together that I really like. But I gave it my best shot, and maybe I am just now at the limit of the light polluted skies, the scope and my processing skills. Comparing this result with previous ones, ok, this one is better, which I hoped for. Processing this "beast" is not so easy either, could not get the sparkle into the image. I tried it 3 times from scratch by now, and finally I told myself, this is it. Next year I plan to get the same image again, give it more time, maybe that will help. Most problematic with this are the flats, which usually do not fit from one session to the other. Which brings up the question: So let's say you have 10 hours of Lum data, perfect flats, and then you get another set of 10 hours, different flats though. How do you integrate those? Do you have to "calibrate" each image of the sets separately with its own flats and then stack them together? Are the calibrated files that PI generates as temporary files the ones to use? Maybe someone "out there 😊😊" has the answer for me, that would be nice.

I might take some Hα data next weekend, when the moon is still up in the mornings. If so another version of this image will come.

Original
B
Final
C

B

Description: Annotated image

Uploaded: ...

C

Description: I had one night where I could capture some Hα data. I believe it made the overall image smoother and nicer, not that there are many more details to see.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4420218
PixInsight job	KOA78SLLBC0TUOLWIKIOYXOV28C6DERV
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m07s.613
RA (top/left)	14h04m54s.547
RA (top/right)	14h04m58s.726
RA (bottom/right)	14h01m18s.888
RA (bottom/left)	14h01m18s.300

Dec (center)	+54°24′00″.71
Dec (top/left)	+54°02′56″.48
Dec (top/right)	+54°44′42″.30
Dec (bottom/right)	+54°44′58″.21
Dec (bottom/left)	+54°03′12″.34

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M101 Hα-LRGB

M101 Hα-LRGB

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M101 Hα-LRGB

M101 Hα-LRGB

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