AstroPhotography by Dan Richey

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M 103
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M 103

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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,[3] though the star is not a member of the 172-star cluster. M103 is about 25 million years old

Object Information

Name M 103
Type Open Cluster
Constellation Cassiopeia
Catalogue NGC 581

Acquisition / Processing

Exposure L - 15 x 240 sec Bin1
RGB - 8 x 240 sec each Bin2
Total 2.60 Hr
Telescope AP 160 @ f7.7
Camera SBIG STF-8300
Camera Temp -30ºC
Guiding SBIG SG4 / AP 105
Mount AP 900GTO
Filters Astrodon-Gen 2 LRGB
Processing CCDStack
PhotoShop CS5
Location San Pedro Creek, NM
Date November 7, 2013

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