Hemisphere:  Northern  ·  Contains:  Andromeda Galaxy  ·  M 110  ·  M 31  ·  M 32  ·  NGC 205  ·  NGC 221  ·  NGC 224
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Messier 31, 


            Alf Jacob Nilsen
Messier 31
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Technical card

Imaging telescopes or lenses: Celestron RASA8

Imaging cameras: ZWO ASI294MC PRO

Mounts: iOptron GEM45EC

Guiding telescopes or lenses: ZWO 30mm f/4 Mini Guide Scope

Guiding cameras: ZWO ASI120Mini

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

Filters: IDAS (Tokai) LP-filter

Dates:Sept. 18, 2020

Frames: 233x30"

Integration: 1.9 hours

Avg. Moon age: 1.21 days

Avg. Moon phase: 1.64%

Basic astrometry details

Astrometry.net job: 3875382

RA center: 0h 42' 17"

DEC center: +41° 16' 40"

Pixel scale: 4.777 arcsec/pixel

Orientation: 270.950 degrees

Field radius: 1.654 degrees

Resolution: 2000x1488

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

Data source: Backyard


My second attempt with RASA8. It is impressive what this small scope can do in seconds. Over two nights I used 30 secs subs to capture M31. The subs could have been even shorter (15 secs?) to avoid the burn out of the core. The scope performs very well on iOptrron's GEM45EC and with Celestron focus motor it is easy to get good focus from the controll room in the garage. Missing now are clear skies! Comments are welcome!



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Messier 31, 


            Alf Jacob Nilsen