M 103 – NGC 581


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M 103 is an open cluster in Cassiopeia, discovered by Mechain in 1781 and this was the last object that Messier included in his original catalog. This is a rich cluster, with 172 confirmed members, and it is a relatively young cluster, about 25 million years.

Additional Information


Name(s): M 103. NGC 581

Type: Open Cluster

RA:  01h 33m 23s

Dec: +60° 38’ 53”

Constellation: Cassiopeia

Size (arcmin): 6×6

Magnitude: +7.4

Distance: 10,000 ly


Date: 2012-10-15

Location: Corbera de Llobregat, Barcelona, Catalonia

Size (arcmin): 14×10

Telescope: Celestron 11” HD f/10

Camera: FLI ML6303 (3072x2048pix)

Guiding: Orion SSAG/Nikkor 500mm f/8

Total exposure: 11 min

Processing: CCDStack, Photoshop CC 2016 and PixInsight

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