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Messier 101
Object Information:

Messier 101

Constellation - Ursa Major Distance - 23 million light years

Messier 101 is a spiral galaxy and is the largest member of a small galaxy cluster located 23 million light years distant. It shines with the luminosity of 33 billion suns and it's size is estimated to be 190,000 light years across.

Image date:

April 21-22, 2017

Exposure Information:

Luminance exposure - 176 minutes
R,G & B filtered exposures - 80 minutes each

Imaged at:

San Diego Astronomy Association site at Tierra del Sol, San Diego County, California

Equipment:

RCOS 10" RC at f/9, SBIG STT-8300, Astro-Physics AP 900