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The Details
Object
M 22 Globular Cluster in Sagittarius
Optics
Astro-Physics 12" Mak-Cass f/8
Platform
Astro-Physics 1600 Mount with absolute encoders
Camera
FLI 16803 Proline CCD
Filters
Tru-Balance LRGB filter set Gen 2
Date
13 May 2015
Location
Las Campanas Observatory, Chile
Exposure
L 6 ea x 300 sec 1x1 bin; RGB 4 ea x 300 sec 1x1 bin
Software
ACP, Maxim DL/CCD, , CCDStack 2, Photoshop CS5
Orientation
Field of view: 52' x 35' centered on RA 18h36m24s
DEC-23°53'23" (2000). North angle 359.7°; east 90° CCW from north
Notes
M22 is the third brightest globular cluster in the heavens, with only the southern hemisphere clusters Omega Centauri and 47 Tucanae besting it.  It’s also one of the closest to us at only 10,000 light-years distance.  Spanning nearly 70 light years across, M 22 has over 100,000 stars contained within its volume.  Its galactic coordinates at 09.8923-07.5516 positon it near the galactic dust plane and close to the galactic bulge, resulting in an attenuation of the light we observe from it and a yellowing of that light due to interstellar gas and dust.

 

 

 

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