Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
Getting plate-solving status, please wait...
M51 The Whirlpool Galaxy, 


            John Schnupp
M51 The Whirlpool Galaxy

M51 The Whirlpool Galaxy

Technical card

Resolution: 1888x1584

Dates:May 8, 2018

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 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


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.



John Schnupp
License: None (All rights reserved)

Sky plot

Sky plot


M51 The Whirlpool Galaxy, 


            John Schnupp