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 M41 Open Star Cluster 

Messier 41 (also known as M41 or NGC 2287) is an open cluster in the Canis Major constellation. It was discovered by Giovanni Batista Hodierna before 1654 and was perhaps known to Aristotle about 325 BC.[3] M41 lies about four degrees almost exactly south of Sirius. It contains about 100 stars including several red giants, the brightest being a spectral type K3 giant near the cluster's center. The cluster is estimated to be moving away from us at 23.3 km/s.[1] The diameter of the cluster is between 25 and 26 light years. Its age is estimated at between 190 and 240 million years old. M41 is also referred to as NGC 2287.. [Text from WIKIPEDIA]

Optics: GSO RC 10" F8 2000mm - Astrograph Ritchie-Chrétien
Mount: AP Mach1 GTO on Gemini Q-Lock tripod
Camera: ATIK 4000LE with SX USB Filter Wheel
Filters: Baader LRGB 2"
Guiding Systems: Unguided
Dates/Times: 28 March 2012
Location: Pragelato - Turin - Italy
Exposure Details: L:R:G:B => 5:5:5:5 = > (1x5):(1x5):(1x5):(1x5) [num x minutes]
Cooling Details: -20 °C
Acquisition: Maxim DL/CCD, Perseus
Processing: CCDStack2,PS CS5
Mean FWHM: 3.22"
SQM-L: 20.81