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Contains:  NGC 4039, Antennae, NGC 4038
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Arp 244 - Antennae Galaxies, 


            Gary Imm
Arp 244 - Antennae Galaxies

Arp 244 - Antennae Galaxies

Technical card

Resolution: 1666x1171

Dates:April 24, 2019April 25, 2019April 26, 2019May 1, 2019

Astrodon Blue 31mm Gen2 I-Series: 280x60" (gain: 139.00) -21C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 280x60" (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 600x60" (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 280x60" (gain: 139.00) -20C bin 1x1

Integration: 24.0 hours

Avg. Moon age: 22.19 days

Avg. Moon phase: 50.63% job: 2693019

RA center: 180.477 degrees

DEC center: -18.882 degrees

Pixel scale: 0.782 arcsec/pixel

Orientation: 96.952 degrees

Field radius: 0.221 degrees

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

Data source: Backyard


This object is a pair of colliding galaxies located 60 million light years away in the constellation of Corvus. I find this object to be one of the most visually fascinating of all of the deep sky objects. The galaxies have been deformed so severely by their gravitational interaction that it is hard to even recognize the original shape of each galaxy. The cores of the two galaxies can be seen in the two brightest areas located next to each other at the same vertical height in the image.

The starburst phase typically associated with interacting galaxies is clearly seen in the many pinkish star formation areas of each galaxy. Beautiful dense star streams are evidence that this interaction has been occurring for a long time. Along with everything else, the dust lanes have been warped into a knotted wonderful mess. The transition of these two galaxies into a single galaxy should be fun and interesting to watch for the next million years.

The two long tidal tails have a combined length of almost 400,000 light years. The long tails in this image are a great example of how tidal interactions cause star streams to flow out of the outer galaxy disk regions when two galaxies approach each other.

I like so many things about this object - the fascinating graceful overall shape, the 3-D look, the detailed star streams and the beautiful star background. My favorite part of this image is the wonderful color diversity, which is unusual for a galaxy image. I see so many colors - the usual blues and pinks, but also varying shades of yellow, orange, brown, gray and bright white.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


Arp 244 - Antennae Galaxies, 


            Gary Imm