Description
Overview:
Messier Object M21 is a Open Cluster discovered by Charles Messier in 1764.
It has an angular size of 13 arc minutes.
Location:
M21 is located within the borders of the constellation Sagittarius at RA
18 04.6 and Declination -22 30.
It is 4,250 light years from the planet Earth which makes it the 28th furthest Messier Object from Earth.
Brightness:
Compared to other objects from the Messier catalog, M21 is a bright deep space object
with a brightness rating of 6.5.
