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Webb’s Cross

M21, NGC 6531

Open Star Cluster in Sagittarius

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Proper Name	Webb's Cross
Messier Number	M21
NGC/IC Number	NGC 6531
Constellation	Sagittarius
Right Ascension	18h 4m 13s
Declination	-22° 29' 24"
Distance	c.3,900 light years c.1,200 parsecs
Magnitude	Apparent: +5.9 Absolute: -4.5
Diameter	Apparent: 14' Actual: 16 light years
Number of Stars	c. 100
Optimum Visibility	July

A very young cluster of hot blue stars. It lies in Sagittarius, in a dense region of the Milky Way that it shares with the Trifid and Lagoon Nebulae.

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