Hemisphere:  Northern  ·  Contains:  IC 4277  ·  IC 4278  ·  IC 4282  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  Whirlpool Galaxy
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Whirpool Galaxy (M51), 


            Alf Jacob Nilsen
Whirpool Galaxy (M51)
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Technical card

Imaging telescopes or lenses: GSO RC 254/2000 Carbon OTA

Imaging cameras: ZWO ASI294MC PRO

Mounts: iOptron CEM60-EC

Guiding telescopes or lenses: Skywatcher EvoGuide 50ED

Guiding cameras: Starlight Xpress Lodestar 2

Software: Astro Pixel Processor APP  ·  Adobe Photoshop CC  ·  PixInsight Core Version 1.8 Ripley

Filters: IDAS (Tokai) LP-filter

Accessory: Optec TCF-S

Dates:March 29, 2020

Frames: 108x300"

Integration: 9.0 hours

Avg. Moon age: 4.60 days

Avg. Moon phase: 22.08%

Basic astrometry details

Astrometry.net job: 3500810

RA center: 13h 30' 9"

DEC center: +47° 12' 32"

Pixel scale: 1.068 arcsec/pixel

Orientation: 162.659 degrees

Field radius: 0.273 degrees

Resolution: 1500x1062

Locations: Osmundstø Observatorium (private backyard observatory), Hidrasund, Vest Agder, Norway

Data source: Backyard


After weeks of rain and clouds, it finally cleared up a few nights in late March and I was abel to do two sessions of M51. 4,5 hrs combined in each session. Unfortunately my flat fields were not good, but I managed to celan up most of the background using PixInsight.



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Whirpool Galaxy (M51), 


            Alf Jacob Nilsen