M 21
Where to look
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Data
- Type
- an open cluster
- Constellation
- Sagittarius
- Magnitude
- 5.9
- Apparent size
- 13.0 ′
- Distance
- 4 250 light years
- Right ascension
- 271.150 °
- Declination
- -22.500 °
- Designations
- M 21 · NGC 6531
- NGC description
- Cl, pRi, lC, st 9...12; = M21
An estimate. NGC 2000.0 carries no distances, and published measurements disagree by up to a third.
The Messier list and the NGC/IC designations come from NGC 2000.0 (Sinnott, 1988), CDS Strasbourg.
Nearby in the same constellation
| Designations | Type | Magnitude | Apparent size |
|---|---|---|---|
| M25 · M 25 | an open cluster | 4.6 | 32.0′ |
| M22 · M 22 | a globular cluster | 5.1 | 24.0′ |
| M23 · M 23 | an open cluster | 5.5 | 27.0′ |
| M8 · Lagoon Nebula | a nebula | 5.8 | 90.0′ |
| M17 · Omega Nebula | a cluster with nebulosity | 6.0 | 46.0′ |
| M20 · Trifid Nebula | a cluster with nebulosity | 6.3 | 29.0′ |
| M18 · M 18 | an open cluster | 6.9 | 9.0′ |
| M28 · M 28 | a globular cluster | 6.9 | 11.2′ |
| M55 · M 55 | a globular cluster | 7.0 | 19.0′ |
| M54 · M 54 | a globular cluster | 7.7 | 9.1′ |
| M69 · M 69 | a globular cluster | 7.7 | 7.1′ |
| M70 · M 70 | a globular cluster | 8.1 | 7.8′ |
| M75 · M 75 | a globular cluster | 8.6 | 6.0′ |
| M24 · Sagittarius Star Cloud | a cluster with nebulosity | — | 30.0′ |