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The Polar Ring of Arp 230
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Name: Arp 230, IC 51
Description: Lenticular Galaxy
Position (J2000): RA 0hr 46m 23.32s Dec -13° 26' 42.88"
Constellation: Cetus
Distance: 60 million light years
Field of view: 1.83 x 1.42 arcminutes
Orientation: North is 67.0° left of vertical
Image Credit: ESA/Hubble & NASA
Release date: January 26, 2015
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This image from the NASA/ESA Hubble Space Telescope shows Arp 230, also known as IC 51

Arp 230 is a galaxy of an uncommon or peculiar shape, and is therefore part of the Atlas of Peculiar Galaxies produced by Halton Arp. Its irregular shape is thought to be the result of a violent collision with another galaxy sometime in the past. The collision could also be held responsible for the formation of the galaxy's polar ring.

The outer ring surrounding the galaxy consists of gas and stars and rotates over the poles of the galaxy. It is thought that the orbit of the smaller of the two galaxies that created Arp 230 was perpendicular to the disc of the second, larger galaxy when they collided. In the process of merging the smaller galaxy would have been ripped apart and may have formed the polar ring structure astronomers can observe today.

Arp 230 is quite small for a lenticular galaxy, so the two original galaxies forming it must both have been smaller than the Milky Way.