Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 2854  ·  NGC 2856  ·  NGC 2857
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Arp 1 and Arp 285, 


            Michael Lorenz
Arp 1 and Arp 285
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Arp 1 and Arp 285

Technical card

Imaging telescopes or lenses: Telescope Engineering Company TEC 140 f/7 APO

Imaging cameras: Atik 460EX mono

Mounts: Astro-Physics 1100 GTO  ·  SkyWatcher AZ EQ6

Guiding telescopes or lenses: Telescope Engineering Company TEC 140 f/7 APO

Focal reducers: TEC Field Flattener

Software: N.I.N.A.  ·  Pleaides Astrophoto PixInsight

Filters: Baader Planetarium LRGB 1.25"

Accessory: Lacerta Motorfokus  ·  Starlight Xpress Lodestar Autoguider  ·  Atik OAG  ·  ATIK EFW2

Dates:Dec. 18, 2020

Frames: 34x600"

Integration: 5.7 hours

Avg. Moon age: 4.08 days

Avg. Moon phase: 17.66%

Basic astrometry details

Astrometry.net job: 4258855

RA center: 9h 24' 39"

DEC center: +49° 21' 39"

Pixel scale: 0.920 arcsec/pixel

Orientation: 2.641 degrees

Field radius: 0.405 degrees

Resolution: 2465x1995

Data source: Backyard


Arp 1 (NGC2857) in one frame with Arp 285 (below right - an interacting pair of galaxies).
Arp 1 is the beautiful little spiral in the center of the frame. It very much resembles the Pinwheel Galaxy in my opinion. In Arp's Atlas of galaxies it is categorized as low surface brightness galaxy. Its distance is 225Mly and measures 125000ly.

Arp 285 below to the right is an interacting pair of galaxies. Both are spirals. NGC2854 is quite a bit larger (65000ly) compared to NGC2856 (35000ly), which comes at a distance of 119Mly. The former is 125Mly away from earth :).

This will receive color treatment, when skies allow!