Celestial hemisphere:  Northern  ·  Constellation: Leo Minor (LMi)
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Arp 21, Gary Imm
Arp 21, Gary Imm

Arp 21

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Arp 21, Gary Imm
Arp 21, Gary Imm

Arp 21

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Description

This Astrobin Debut Object, also known as MCG+05-26-047, is a small spiral galaxy located 400 million light years away in the constellation of Leo Minor at a declination of +30 degrees. This magnitude 15 galaxy spans 0.8 arc-minutes in our apparent view, which corresponds to a diameter of 100,000 light years.

In his Arp catalog, Dr. Arp classified this object into the category of Spiral Galaxies with Three Arms. I am not sure about the so-called “third arm”. I don’t see it anywhere.

By my assessment, our view of this galaxy lies about halfway between face-on and edge-on. Its structure looks fairly simple to me – a 2 strong armed, grand design spiral galaxy which has been distorted to some extent. The right and lower sides of the disk extend much further away from the off-center core. Bright star cluster regions are visible in the disk.

The key question is: what is causing the disturbance? The bright area above and left of the core could be a companion, but it looks more like a superimposed small star to me. I think it is possible that the disturbance culprit may already have been absorbed into the "lumpy" galaxy disk.

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