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Contains:  Helix galaxy, NGC 2685
Getting plate-solving status, please wait...
Arp 336, 


            Gary Imm
Arp 336

Arp 336

Technical card

Resolution: 3697x1971

Dates:April 16, 2018

Astrodon Blue 31mm Gen2 I-Series: 40x60" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 40x60" (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 80x60" (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 40x60" (gain: 139.00) -20C bin 1x1

Integration: 3.3 hours

Avg. Moon age: 0.44 days

Avg. Moon phase: 0.22% job: 2033887

RA center: 8h 55' 35"

DEC center: +58° 44' 16"

Pixel scale: 0.518 arcsec/pixel

Orientation: 279.952 degrees

Field radius: 0.302

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This object is a spiral galaxy located 40 million light years away in the constellation of Ursa Major. It is classified as a polar ring galaxy - a rare type of galaxy with stars, gas and dust orbiting in rings perpendicular to the primary plane of the galaxy. These perpendicular rings are easy to see in the image.

I am fascinated by this unusual structure, of which scientists do not understand the exact cause. Some speculate that it is due to the gravitational merger of two galaxies, but to me it appears too structured and symmetric for that explanation. All other objects I have seen which result from two merged objects are not "clean" and symmetric. Perhaps the merger occurred so far in the past that any lingering star trails have been swept into this perfect configuration.

This object is small, faint and difficult to process. It is about half as large as our Milky Way.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


Arp 336, 


            Gary Imm