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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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M51 The Whirlpool Galaxy, 





    
        

            John Schnupp
M51 The Whirlpool Galaxy

M51 The Whirlpool Galaxy

Technical card

Resolution: 1888x1584

Dates:May 8, 2018

Frames:
ZWO B 1.25": 14x300" (gain: 139.00) -20C bin 2x2
ZWO G 1.25": 14x300" (gain: 139.00) -23C bin 2x2
ZWO L 1.25": 23x300" (gain: 139.00) -20C bin 2x2
ZWO R 1.25": 14x300" (gain: 139.00) -20C bin 2x2

Integration: 5.4 hours

Darks: ~63

Avg. Moon age: 22.52 days

Avg. Moon phase: 46.05%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 21.20

Temperature: 6.00

Astrometry.net job: 2056651

RA center: 202.470 degrees

DEC center: 47.210 degrees

Pixel scale: 0.719 arcsec/pixel

Orientation: 184.996 degrees

Field radius: 0.246 degrees

Locations: Georgia Shore, Georgia, VT, United States

Data source: Unknown

Description

Decided to go galaxy hunting. First image with the SCT in some time. After imaging with my refractor, I forgot how challenging imaging at focal length 2032mm f/10 can be. Had several problems to overcome. I very nearly gave up and put the f/6.3 reducer on, but persistence paid off. It's not a perfect image and there are areas that need improving. There are some dust motes which need to be eliminated with flats, but I am not yet full set up with a light panel. There is also a light leak that needs to be tracked down, I suspect it is in the filter wheel housing or OAG. I was able to mitigate the imperfections but controlling the stretch and black point, along with cropping.

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johnschnupp
John Schnupp
License: None (All rights reserved)
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M51 The Whirlpool Galaxy, 





    
        

            John Schnupp