M81 with Sony (James Muehlner)

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

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M81 with Sony

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M81 with Sony

There's obvious star trailing due to an imperfect polar alignment.

I did this one unguided because guiding doesn't tend to work very well due to excessive backlash in the mount (already sent it back twice, will probably need to do it again).

Also, DSS won't process Sony Raw files directly, so I wrote some scripts to use darktable-cli to convert to TIFF, which DSS can process. After many hours of CPU time to convert all the files, and hours more stacking, I realized that darktable-cli only supports 8bit output, so now I'm going to have to go back and use the darktable GUI to export all the files without bit depth loss.

If anyone knows a more streamlined way of doing this I'd love to hear it.

Original
Final
B

B

Description: Restacked after re-transcoding all base images to 32bit. Tried for a bit better white balance and background separation this time.

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Stacked DSO

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Status	Advanced success
Started	...
Astrometry.net job	3343684
PixInsight job	RXF9IY1JZ4G7GXGXCK52XXT29AAICSCB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h55m34s.503
RA (top/left)	09h58m03s.560
RA (top/right)	09h58m20s.819
RA (bottom/right)	09h53m01s.146
RA (bottom/left)	09h52m52s.502

Dec (center)	+69°04′06″.20
Dec (top/left)	+68°47′16″.57
Dec (top/right)	+69°19′48″.30
Dec (bottom/right)	+69°20′49″.22
Dec (bottom/left)	+68°48′12″.81

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M81 with Sony

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M81 with Sony

M81 with Sony

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