M 81 and M 82 LRGB (Paul Muskee)

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

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M 81 and M 82 LRGB

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M 81 and M 82 LRGB

M 81 and M 82 taken during spring 2020.

H-alpha was also collected but will add that later on (too much data lying around at the moment :-).

Again some small star issues but might be getting somewhere figuring this one out... I found that I collected the red channel only one side of the meridian, which I also did in a previous image and same star issues... Before I had issues with blue stars, since then I collected blue only around the meridian and that seems solved now, but of course.... now I messed up the red channel...

M 33 which I have done recently was perfect, but all channels were full nights and therefore all channels were collected (more or less) equally on both sides of the meridian.

It probably is atmospheric dispersion.

I am working on changing the capture sessions completely so I will collect all RGB channels equally on both sides of the meridian.

I can achieve this by changing filter after each exposure and rotate through them, or change the sequence by working on multiple objects a night...

Very interesting nonetheless and always many things to improve!

Original
B
C
Final
D

B

Description: increased sharpening using a combined mask to protect both background and stars.

Uploaded: ...

C

Description: Improved background. With this action I more or less removed the Integrated Flux Nebula completely, but it was too faint anyways. Impressive anyways that it started showing up!

Uploaded: ...

D

Description: Fixed purple stars using PixelMath

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	3482882
PixInsight job	6ATA5Q4F6J3YPOWDMVX5U0AL4THXNOBE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h55m27s.40
RA (top/left)	09h49m35s.20
RA (top/right)	09h49m57s.62
RA (bottom/right)	10h00m57s.47
RA (bottom/left)	10h01m19s.39

Dec (center)	+69°20′40″.6
Dec (top/left)	+70°02′17″.3
Dec (top/right)	+68°38′19″.5
Dec (bottom/right)	+68°38′22″.4
Dec (bottom/left)	+70°02′19″.5

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M 81 and M 82 LRGB

M 81 and M 82 LRGB

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M 81 and M 82 LRGB

M 81 and M 82 LRGB

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