Messier 81 (Andrew Burwell)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's Galaxy · Cigar Galaxy · M 81 · M 82 · NGC 3031 · NGC 3034 · NGC 3077 · PGC 2719634 · PGC 2721118 · PGC 2723482 · PGC 2724146 · PGC 2725421 · PGC 2726822 · PGC 2727315 · PGC 2728713 · PGC 2728721 · PGC 2729331 · PGC 2730097 · PGC 2730379 · PGC 2730409 · PGC 2730709 · PGC 2730975 · PGC 2731294 · PGC 2731756 · PGC 2731963 · PGC 2732102 · PGC 2732272 · PGC 2732338 · PGC 2732720 · PGC 2732797 · And 25 more.

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Messier 81

Link: https://www.macobservatory.com

Powered byPixInsight

Messier 81

Link: https://www.macobservatory.com

We've had pretty poor weather for the last month, along with some back yard construction and an unexpected freeze here in the south. I only managed two nights on this subject which deserves at least one more. But just don't think I'll have it for a few more weeks now. And I'm not the type to wait around for all the data to come in, so I'm publishing this.

It's also first light with the new ZWO ASI2600MM-Pro camera, their new 36mm filter wheel and the M68 OAG. I got a full set of Chroma filters for this one to use. I had been thinking I might get the Antila 3nm filters, but looks like they can't quite match the AR coating on the more expensive filters yet. I also shot some HA for this image, but my flats are overcorrecting for some reason only on the HA, so I might have to experiment with some new flat exposures to get it just right. This is really odd as I did not have this issue with the bigger brother to this camera, the ASI6200.

Original
Final
B

B

Description: New revision now with HA data. There's something I'm doing when processing that's creating blue centers on my stars, and I can't figure out what it is. I'm making a proper star mask, but adding saturation seems to blue out the center of the stars.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4294349
PixInsight job	XVXMN0E9QD1E96Z1FNTSADKQ7O68ZW50
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h57m43s.24
RA (top/left)	09h48m51s.52
RA (top/right)	09h50m00s.43
RA (bottom/right)	10h05m47s.36
RA (bottom/left)	10h06m13s.44

Dec (center)	+69°16′39″.6
Dec (top/left)	+70°17′50″.2
Dec (top/right)	+68°12′38″.8
Dec (bottom/right)	+68°13′53″.5
Dec (bottom/left)	+70°19′12″.7

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Messier 81

Messier 81

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Image Index:

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Messier 81

Messier 81

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B

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