AstroPhotography by Dan Richey

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Discovered by Jean-Dominique Maraldi in 1746, and is one of the largest known globular clusters. Messier rediscovered it in 1760, but thought it a nebula without any stars associated with it. William Herschel, in 1783, was the first to resolve individual stars in the cluster. M2 is, under extremely good conditions, just visible to the naked eye. Binoculars or a small telescope will identify this cluster as non-stellar, while larger telescopes will resolve individual stars, of which the brightest are of apparent magnitude 13.1. Characteristics M2 is about 37,500 light-years distant from Earth. At 175 light-years in diameter, it is one of the larger globular clusters known. The cluster is rich, compact, and significantly elliptical. It is 13 billion years old and one of the older globulars associated with the Milky Way Galaxy.

Object Information

Name M2
Type Globular Cluster
Constellation Aquarius
Catalogue NGC 7089

Acquisition / Processing

Exposure LRGB: 50 : 25 : 25 : 25 Minutes
Total 2.08 Hours
Telescope AP 160EDF-FF
Camera SBIG STT-8300
Camera Temp -40ÂșC
Guiding SG4-AP 105
Mount AP 1100GTO
Filters Astrodon LRGB
Processing PixInsight
Adobe LightRoom
Location San Pedro Creek, NM
Date 9/21/2017

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