Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  IC 740  ·  NGC 3913  ·  NGC 3916  ·  NGC 3921  ·  PGC 2485474  ·  PGC 2485508  ·  PGC 2485575  ·  PGC 2485868  ·  PGC 2485897  ·  PGC 2486190  ·  PGC 2486240  ·  PGC 2486691  ·  PGC 2486701  ·  PGC 2486954  ·  PGC 2487197  ·  PGC 2487785  ·  PGC 2488118  ·  PGC 2488371  ·  PGC 2488967  ·  PGC 2489412  ·  PGC 2489542  ·  PGC 2489548  ·  PGC 2489609  ·  PGC 2489926  ·  PGC 2490363  ·  PGC 2490407  ·  PGC 2490574  ·  PGC 2490924  ·  PGC 2491113  ·  PGC 2491428  ·  And 20 more.
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From NGC 3913 to NGC 3921 (Arp 224), Göran Nilsson
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From NGC 3913 to NGC 3921 (Arp 224)

Getting plate-solving status, please wait...
From NGC 3913 to NGC 3921 (Arp 224), Göran Nilsson
Powered byPixInsight

From NGC 3913 to NGC 3921 (Arp 224)

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Description

Here is an image that appears to contain more galaxies than stars. The most peculiar object is Arp 224 (= NGC 3921). In the catalogue given out Dr. Halton C. Arp between 1961 and 1966, named the Atlas of Peculiar Galaxies, Arp 224 was  classified it as a "galaxy with amorphous spiral arms". The odd shape of this object could be the result of two merging galaxies. It is located 280 million light years away in Ursa Major. There are very few images of Arp 224 on Astrobin.

The galaxy near the bottom of the image is NGC 3913, a 12.8 magnitude spiral galaxy some 46 million light years from us. It is also very rarely imaged.

In Gary Imm's description of his image of this area (https://www.astrobin.com/medktn/) he pointed out that the orange elliptical just below Arp 224 is PGC 2491113, the brightest galaxy in a cluster of galaxies known as Zwicky Cluster 1148.6+5523, one billion light years away.

I took this image with the Margareta Westlund Telescope in southern Spain, owned by the Swedish Amateur Astronomical Society and accessible remotely to its members.

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From NGC 3913 to NGC 3921 (Arp 224), Göran Nilsson