M108 ASI533MC First light (Dan Kusz)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 108 · NGC 3556

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M108 ASI533MC First light

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M108 ASI533MC First light

Messier 108 (M108), nicknamed the Surfboard Galaxy, is a barred spiral galaxy located in the constellation Ursa Major. The galaxy lies at an approximate distance of 45.9 million light years from Earth and has an apparent magnitude of 10.7. It has the designation NGC 3556 in the New General Catalogue.

This is the first light image of my ASI 533MC-Pro OSC camera. I have never used OSC before so I had to overcome many hurdles with this image. I have put this rig together for galaxy season with my Edge 8hd, which has only taken one picture before this of the moon.

This was a frustrating setup to get working, as I usually use refractors. Guiding performance was not as expected, 0.7-0.8 total RMS. I was using an OAG and a 290mm, but I may try a separate guide scope, as I use an auto focus routine and it throws off my guiding during the focusing and causes SGP to go into recovery mode because of guide star loss. This is a very difficult native image scale to work with, and I'm not used to how big the stars appear in the image.

I used unity gain and 4 min subs through a UV/IR filter only. This seems to deliver good subs and I will stick with these settings for future images. I found the image a little more flat than I'm used to with mono and filters. I separated each colour channel and processed as I would with mono/filter combo. I had to really push the image to bring out detail, but I think it came out well considering the size of the target.

Any feedback would be great, as this is a first light and completely new set up and processing with lots of learning to go!

CS

Dan.

ZWO ASI1600MM/QHY163M
Canadian Astrophotography
Pacific Northwest Astrophotographers

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Status	Advanced success
Started	...
Astrometry.net job	4221079
PixInsight job	EWJBGTFI53X7W2X1S32Z8SF0F78BWGT9
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h11m30s.916
RA (top/left)	11h12m22s.366
RA (top/right)	11h09m45s.152
RA (bottom/right)	11h10m40s.930
RA (bottom/left)	11h13m16s.430

Dec (center)	+55°40′22″.97
Dec (top/left)	+55°55′21″.17
Dec (top/right)	+55°47′46″.71
Dec (bottom/right)	+55°25′24″.30
Dec (bottom/left)	+55°32′53″.53

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M108 ASI533MC First light

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M108 ASI533MC First light

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