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The Details
Object
M 4 Globular Cluster in Scorpius
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
14 May 2015
Location
Las Campanas Observatory, Chile
Exposure
L 5 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 52' centered on RA 16h23m33s
DEC-26°32'09" (2000). North angle 359.7°; east 90° CCW from north
Notes
M4, one of the nearest globular clusters to us, lies about 7000 light-years from Earth.  Spanning 75 light-years across, it a loosely concentrated globular estimated at be about 12.2 billion years old.  Interstellar dust in the direction of M4 accounts for its color extinction and orange-like appearance.

M4 is a fine visual object in a moderately-sized telescope and can easily be found by star hopping a bit over 1 arc-degree W of the bright red supergiant star Antares.

 

 

 

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