Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  NGC 4712  ·  NGC 4725  ·  NGC 4747
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The one-armed galaxy NGC4725 with NGC4747 and NGC4712, dkuchta5
The one-armed galaxy NGC4725 with NGC4747 and NGC4712
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The one-armed galaxy NGC4725 with NGC4747 and NGC4712

Getting plate-solving status, please wait...
The one-armed galaxy NGC4725 with NGC4747 and NGC4712, dkuchta5
The one-armed galaxy NGC4725 with NGC4747 and NGC4712
Powered byPixInsight

The one-armed galaxy NGC4725 with NGC4747 and NGC4712

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Description

While most spiral galaxies have two or more arms, this has just one prominent arm that wraps around it several times, although there are hints of some short secondary arms.

The reason for this unusual arm configuration is its interaction with NGC4747, the galaxy at lower right.  You can see the tidal streams of stars pointing from NGC4747 toward and away from NGC4725, indicating the two interacted in the past with a close pass.

The third, small galaxy to the left is NGC4712.  It’s an attractive little spiral, but a little too small for the resolution available with our skies.

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The one-armed galaxy NGC4725 with NGC4747 and NGC4712, dkuchta5