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The Details
Object
M 2 Globular Cluster in Aquarius
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
20/21/24/25 June and 15 July 2015
Location
Las Campanas Observatory, Chile
Exposure
L 15 ea x 300 sec 1x1 bin; RGB 8 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 21h33m29s
DEC-00°49'06" (2000). North angle 359.7°; east 90° CCW from north
Notes
Globular cluster M2 in the constellation Aquarius lies about 38.000 light-years from Earth and spans nearly 175 light-years across, making it one of the largest clusters in our galaxy.  It has an extremely dense core compared to most other globular clusters and contains over 150,000 stars.

M 2 was discovered by the Italian-born French astronomer Jean-Dominique Maraldi on September 11, 1746.  Charles Messier didn’t spot the cluster until September 11, 1760 but thought it a “nebula without stars”.  It wasn’t until 1783 that William Herschel first resolved the cluster into individual stars.

Total exposure time was 3 hours 15 minutes. This image is the result of a collaborative effort between Howard Hedlund of Astro-Physics, Inc. and Dave Jurasevich.

 

 

 

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