Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5422  ·  NGC 5457  ·  NGC 5461  ·  NGC 5473  ·  NGC 5474  ·  NGC 5485  ·  NGC 5486
Pinwheel Galaxy M101, Avo
Pinwheel Galaxy M101
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Pinwheel Galaxy M101, Avo
Pinwheel Galaxy M101
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Description

M101 has six prominent companion galaxies: NGC 5204, NGC 5474, NGC 5477, NGC 5585, UGC 8837 and UGC 9405. As stated above, the gravitational interaction between M101 and its satellites may have triggered the formation of the grand design pattern in M101. M101 has also probably distorted the companion galaxy NGC 5474.

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Pinwheel Galaxy M101, Avo