M 101 Pinwheel Galaxy (Michael Timm)

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 · Pinwheel galaxy

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M 101 Pinwheel Galaxy

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M 101 Pinwheel Galaxy

I am really not satisfied with this picture. For about 3 hours lights one can see very few details and the image noise is bad. The sky was very clear and seeing was incredible good. I dont know what went wrong here. At the moment i blame the very small pixels of the ASI178MC, or maybe i exposed too less or gain was too high *sigh* So much to try to get better...

Another idea: At the moment i am shooting without any IR/UV blocking filter. Maybe this is wrong for this type of target?

Next idea: This picture was taken with a slightly too big distance between reducer and CCD. It seems not very logical, but maybe this has something to do with it?

Another hint i got: The stacked image is very light-polluted - which i can not explain, it was very dark and the sky was good - so maybe i simply exposed too long?

Original
Final
B

B

Description: PI is simply amazing. Despite all the problems i had with the light entering the focuser, i could restore a lot more information by reprocessing this image with PI.

Uploaded: ...

"Nordish by nature"
Ritchey Chretien telescopes GSO Family

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Status	Advanced success
Started	...
Astrometry.net job	2154802
PixInsight job	H1KOHR1ONGE8KOWQAXUX4JL0I3XGRIA0
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m11s.447
RA (top/left)	14h03m27s.886
RA (top/right)	14h04m29s.423
RA (bottom/right)	14h02m54s.785
RA (bottom/left)	14h01m53s.878

Dec (center)	+54°20′59″.99
Dec (top/left)	+54°07′30″.55
Dec (top/right)	+54°28′40″.91
Dec (bottom/right)	+54°34′29″.48
Dec (bottom/left)	+54°13′15″.72

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M 101 Pinwheel Galaxy

M 101 Pinwheel Galaxy

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M 101 Pinwheel Galaxy

M 101 Pinwheel Galaxy

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