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M21 - NGC 6531 - Open Cluster

 
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Messier 21 (M21) is a young Open Cluster of stars containing only about 57 confirmed members. This open cluster is located in the constellation Sagittarius. It is very close to M20, the Trifid Nebula (0.75 degrees) and is also near M8, the Lagoon Nebula (2.5 degrees). M21 can often be located in wide-field images of these two nebula. It is about 4,250 light years from earth and is approximately 20 light years in diameter. It was discovered by Charles Messier in 1764.

Location Data
Constellation: Sagittarius
Right ascension: 18h 4.6m
Declination: Declination: -22° 30′
Distance:  4,250 ly
Size:  20 ly

Observation Data
Apparent magnitude: 6.5
Apparent size: 13.0' arcmins

M21 Location - Image From Stellarium

The images With Blue Borders were taken using equipment provided by the MAS Observatory
Click on the Image to View It Full Size

Sagittarius Wide Field  by Arun HegdeM8 / M20 / M21 Sagittarius Region
Widefield: Canon 5D Mark IV w/ 400mm f/5.6 at /6.3. 56 frames at 80 secs each. Process: RNC color stretch and Photoshop.
Jul. 2018
Photo by: Arun Hegde

M20 / M21 - F ScopeM20 - Trifid Nebula with M21
F-Scope, Hyperstar at f/1.9
Canon 60D DSLR, 10 30sec exp.
Aug 2015
Photo by: Tamas Kriska