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 M3 Globular Star Cluster 
2200 x 1641 (Mid-Hi Resolution)            3308 x 2468 (High Resolution)

NGC5623
     

About:
This immense ball of half a million stars older than the Sun lies over 30,000 light-years away. Cataloged as M3 (and NGC 5272), it is one of about 150 globular star clusters that roam the halo of our Milky Way Galaxy. Even in this image, individual stars are difficult to distinguished in the densely packed core, but colors are apparent for the bright stars on the cluster's outskirts. M3's many cool "red" giant stars take on a yellowish cast, while hotter giants and pulsating variable stars look light blue. A closer look at the deep telescopic view also reveals a host of background galaxies. Itself about 200 light-years across, the giant star cluster is a relatively bright, easy target for binoculars in the northern constellation Canes Venatici, The Hunting Dogs, and not far from Arcturus. [Text adapted from APOD]

Optics: Takahashi FSQ-106EDXIII F/5 530mm. - APO Refractor
Mount: AP Mach1 GTO
Camera: QSI-683WSG
Filters: Astrodon E Series Gen II LRGB 31mm
Guiding Systems: SX Lodestar
Dates/Times: April/May 2012
Location: Pragelato - Turin - Italy
Exposure Details: L:R:G:B => 70:25:25:25 = > (14x5):(5x5):(5x5):(5x5) All Bin1 [num x minutes]
Cooling Details: -25 C
Acquisition: Maxim DL/CCD, Perseus
Processing: CCDStack2+, PS CS2
Mean FWHM: 2.78
SQM-L: 20.32