Hemisphere:  Northern  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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Bode's Galaxy M81, 


            Alf Jacob Nilsen
Bode's Galaxy M81
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Technical card

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

Imaging cameras: ZWO ASI1600 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 LPS D1 IDAS light pollution filter  ·  ZWO EFW 7x36mm LRGB Ha, Oiii, Sii

Accessory: Optec TCF-S

Dates:April 20, 2020

Frames: 105x300"

Integration: 8.8 hours

Avg. Moon age: 27.19 days

Avg. Moon phase: 6.07%

Basic astrometry details

Astrometry.net job: 3492547

RA center: 9h 55' 46"

DEC center: +69° 2' 56"

Pixel scale: 0.996 arcsec/pixel

Orientation: 292.777 degrees

Field radius: 0.268 degrees

Resolution: 1500x1229

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

Data source: Backyard


My first attempt using ZWO ASI1600 and EFW for this LRGB image of M81. Also my first try processing an LRGB image with APP (for stacking and calibration) and PI (LRGB combinition and adjustments). 36x300sec LUM, 23x300sec RGB. Relatively satisfied, but small black rings around the stars are irritating. I am in a cpontinious learing process :)



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Bode's Galaxy M81, 


            Alf Jacob Nilsen