Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 5205  ·  NGC 5216  ·  NGC 5218
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ARP 104 Keenan's system, Mathieu Guinot
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ARP 104 Keenan's system

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ARP 104 Keenan's system, Mathieu Guinot
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ARP 104 Keenan's system

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Description

Arp 104, also known as Keenan’s System, consists of the two interacting galaxies NGC 5216 (spiral one at bottom) and NGC 5218 (elliptical one at top) which are connected by a thin stream of gas, in which new stars are forming. The stream is about 150,000 light years in length and was created when the two galaxies passed by each other, their mutual gravity pulling the gas out. The newly formed hot and massive stars turn the stream blue. 

ARP 104 is located in the constellation Ursa Major at a distance of about 17 million light-years from Earth and there is a large collection of other small and medium galaxies in the field of view (A version is a crop, please see B version for the full FOV). The other prominent one in the top left part of the image is the beautiful spiral NGC 5205.

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    ARP 104 Keenan's system, Mathieu Guinot
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  • ARP 104 Keenan's system, Mathieu Guinot
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ARP 104 Keenan's system, Mathieu Guinot