View source for Messier 103

Messier 103 (also known as M103, or NGC 581) is an open cluster where a few thousand stars formed in the constellation [[Cassiopeia]]. This open cluster was discovered in 1781 by Charles Messier’s friend and collaborator Pierre Méchain. It is one of the most distant open clusters known, with distances of 8,000 to 9,500 light years from the earth and ranging about 15 light years apart. There are about 40 member stars within M103, two of which have magnitudes 10.5, and a 10.8 red giant, which is the brightest within the cluster. Observation of M103 is generally dominated by the appearance of Struve 131,though the star is not a member of the 172-star cluster. M103 is about 25 million years old.








==HGS Session References== 

HGS Sessions - Clearing [[San Francisco Golden Gate Bridge, 55 Reversal Grid]] - 3/31/2015 <ref>HGS Session</ref>



==References==

<references/>


Found in HGS Manual on Page 108 

Found in HGS Manual on Page 115




[[Category: Ascension]][[Category: HGS Manual]]