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NGC 6171

Proper NameNone
Messier NumberM107
NGC/IC NumberNGC 6171
Right Ascension16h 32m 32s
Declination-13° 3' 14"
Distancec.20,900 light years
c.6,400 parsecs
MagnitudeApparent: +7.92
Absolute: -6.11
DiameterApparent: 13'
Actual: 79 light years
Optimum VisibilityJune
NotesM107 is notable for its unusually loose structure. Where globular clusters of this kind tend to be strongly bound into a globular form, the stars of M107 are far less centrally concentrated. On the Shapley-Sawyer scale of cluster concentration (by which class I is the most centrally concentrated and class XII is extremely loose) M107 is rated as concentration class X.

A very loose globular cluster in the constellation Ophiuchus, lying about 20,000 light years from Earth.

Messier 107, one of a crop of globular clusters lying close to the galactic plane in the constellation of Ophiuchus. Imagery provided by Aladin sky atlas


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