M 101

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Description: M 101 is an asymmetric spiral galaxy because its core is displaced from the center of its disk. Halton Arp called it a "Spiral with One Heavy Arm". The Chandra orbiting, X-Ray Observatory has recently found a possible new class of x-ray sources in M 101. These could be intermediate-sized black holes.

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Constellation: Ursa Major
Distance: ~27 million light years
Apparent Size: 22'
Date: 27-30 april 2006
Equipment: 12" RC @ f/9, ST10XME, AP1200
Exposure: LRGB: 170-120-100-150 minutes, all unbinned