Messier 21 (NGC6531) is an open cluster object of interest in space. It lies at a distance of 4250 light years away in the constellation of Sagittarius.
It is referred to as M(21) when it was catalogued by Charles Messier in 18th - 19th Century France. It is also referred to as NGC(6531) in the New General Catalogue. This is a list of deep space objects that was compiled by John Louis Emil Dreyer in 1888 in an update to John Herschel earlier catalogue.
The Open Cluster's location is 18:04.6 (R.A.) and -22:30 (Dec.). Its Visual Brightness is a 6.5 Magnitude and has an apparent magnitude of 7 with an apparent dimension of 13.0 . The object can not be seen by the naked eye, you need a telescope to see it.
(M21,NGC6531) is a open cluster. It was discovered in 1764 by Charles Messier. It's location is RA(18:04.6), Dec(-22:30) and its distance is calculated 4.25 light years away. Its visual Brightness is 6.5. Its apparent dimensions measured in arcmins is 13.0.
|Name||Messier 21 (NGC6531)|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Year of Discovery||1764|