Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)
Getting plate-solving status, please wait...
Arp 183 (with Arp 36), 


            Gary Imm
Arp 183 (with Arp 36), 


            Gary Imm

Arp 183 (with Arp 36)

Getting plate-solving status, please wait...
Arp 183 (with Arp 36), 


            Gary Imm
Arp 183 (with Arp 36), 


            Gary Imm

Arp 183 (with Arp 36)

Imaging telescopes or lenses: Celestron EdgeHD 11

Imaging cameras: ZWO ASI 294 MM Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

Software: Main Sequence Software Sequence Generator Pro  ·  Pixinsight  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Lum 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW 2″X7  ·  Celestron OAG  ·  MoonLite Focuser for EdgeHD 11

Dates:Feb. 20, 2021Feb. 21, 2021Feb. 22, 2021

Astrodon Blue 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Lum 31mm Gen2 I-Series: 60x120" (gain: 120.00) -20C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2

Integration: 5.0 hours

Avg. Moon age: 8.94 days

Avg. Moon phase: 66.02%

Astrometry.net job: 4266327

RA center: 13h 34' 34"

DEC center: +31° 25' 0"

Pixel scale: 0.343 arcsec/pixel

Orientation: -2.788 degrees

Field radius: 0.226 degrees

Resolution: 3959x2614

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard


This image captures a pair of Arp objects located in the constellation of Canes Venatici at a declination of +31 degrees. Both of these are Astrobin Debut Objects.

Each Arp object is located about 225 million light years away. They are likely to be interacting with each other. Arp 183 (magnitude 14.4) is located at lower left and Arp 36 (magnitude 15.0) is at upper right. Each galaxy is similar is size, spanning 1.4 arc-minutes in our apparent view and having a diameter of 90,000 light years.

Arp 183 looks like a typical face-on grand design spiral galaxy with the arms slightly disturbed. It was classified by Dr. Arp into the category of Galaxies with Narrow Filaments. The "filaments" are the faint star streams which extend from the core, below right and below left, in between the 2 main arms. I believe that these "filaments" are simply a result of the disturbance of this galaxy, likely from Arp 36.

The Arp 183 galaxy structure is a bit confusing because of the yellowish features which appear overlaid on the bluish galaxy. The yellow object left of the core is likely a superimposed star. The yellow object to the lower right is a distant galaxy (2MASX J13345139 +3123014), located much further away at 1.6 billion light years. There are two bright parts to this small object at lower right - I am not sure if they represent the same distant galaxy (disturbed), two separate galaxies, or a galaxy and a star.

Arp 36 is an interesting "integral sign" galaxy. For more information on that object, please see my dedicated post on it here.

Although the Arp objects take center stage here, I like the numerous background galaxies just as much. There are a number of interesting galaxy cluster patterns here. The “<” pattern of distant galaxies in the middle of the image is my favorite. I also like the galaxy groupings above and right of center. These galaxies look to be about 2 billion light years away.