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, IC 4263
Getting plate-solving status, please wait...
Messier 51 The Whirlpool Galaxy, 


            Harri Heikkinen
Messier 51 The Whirlpool Galaxy

Messier 51 The Whirlpool Galaxy

Technical card

Resolution: 1502x1072

Dates:March 24, 2019

40x120" ISO1600
10x300" ISO1600

Integration: 2.2 hours

Darks: ~20

Flats: ~40

Flat darks: ~20

Bias: ~20

Avg. Moon age: 18.55 days

Avg. Moon phase: 84.65%

Bortle Dark-Sky Scale: 8.00

Temperature: -1.00 job: 2608341

RA center: 202.467 degrees

DEC center: 47.199 degrees

Pixel scale: 1.970 arcsec/pixel

Orientation: 91.152 degrees

Field radius: 0.505 degrees

Locations: Backyard, Vantaa, Finland

Data source: Backyard


My first ever guided long exposure deep sky session and first light of recently acquired Celestron C6 SCT, F6.3 reducer, Skywatcher NEQ6 mount and CLS clip-on filter in a heavily light polluted backyard. Despite poor seeing, guiding troubles, collimation challenges and backfocus issues combined with the CLS filter making color balancing in post nearly impossible I'm quite happy that something came out of it after all. Cropped out distorted corners due to incorrect backfocus. Also collimation may still be a little off as the image is a bit soft.

Unmodified Canon 1100d ISO 1600 and Altair GPCAM2 224c guidecamera. 10x300" lights + 40x180" lights. Calibration: 40 flats, 20x300" darks + 20x180" darks, 20 dark flats, 20 bias.



Harri Heikkinen
License: None (All rights reserved)

Sky plot

Sky plot


Messier 51 The Whirlpool Galaxy, 


            Harri Heikkinen