| M21 |
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| NGC 6531 | |||||||||||
| Type: | Open Cluster | ||||||||||
| Constellation: | Sagittarius | ||||||||||
| Magnitude: | 7.0 | ||||||||||
| Size: | 13.0' | ||||||||||
| RA-Dec: | 18h 4.6m - -22 30 | ||||||||||
| Difficulty: | ? | E=easy, T=tough, C=challenging | |||||||||
| Description: | |||||||||||
| This cluster of bright stars lies north of the Trifid nebula. M21 contains about 60 stars that are readily visible in a small telescope. M21 has a strong concentration of stars towards its center and makes an impressive sight in binoculars along with M20 and M8. In larger telescopes, a "diamond ring" of 10 or so stars can be seen. M21 is an extremely young cluster, being only 5 million years old. | |||||||||||
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