M21 is a magnitude 5.9 galactic star cluster that was first observed by Charles Messier in June 1764. This cluster is located close to the Trifid Nebula, and can be seen in the same field of view using a telescope with a low power eyepiece. M21 is located the constellation Sagittarius, which has more Messier objects than any other constellation.
This is an RGB color composite CCD image taken with a Takahashi FCT-150 using an ST-8XE.
M21 (NGC 6531)
Constellation: Sagittarius
RA: 18h 04m 36s Dec: -22d 29' 31"
April 9, 2006
Image by Sid Leach
Scottsdale, Arizona
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