Uploaded 16-Aug-08
Taken 8-Sep-08
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Dimensions1448 x 1108
Original file size1.67 MB
Image typeJPEG
Color spacesRGB
Date modified8-Sep-08 20:33
M103

M103

09.22.07
DSI Pro II, C11 @ 1990mm f/7.1, EQ6, guided with ED80 DSI Pro I
L: 17 x 60 seconds
RB: 23 x 60 seconds
G: Pseudo
Total Exposure: 1 hour, 3 minutes

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, 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. (from Wikipedia)