Statements (24)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:open_cluster
|
| gptkbp:age |
4.6 million years
|
| gptkbp:alternativeName |
NGC 6531
|
| gptkbp:angularSize |
13 arcminutes
|
| gptkbp:apparentMagnitude |
6.5
|
| gptkbp:cataloguedIn |
gptkb:Messier_Catalogue
gptkb:New_General_Catalogue |
| gptkbp:constellation |
gptkb:Sagittarius
|
| gptkbp:declination |
-22° 29′ 24″
|
| gptkbp:discoveredBy |
gptkb:Charles_Messier
|
| gptkbp:discoveredIn |
June 5, 1764
|
| gptkbp:distanceFromEarth |
4,250 light-years
|
| gptkbp:epoch |
gptkb:J2000
|
| gptkbp:hasViewOf |
astronomer
small telescopes |
| https://www.w3.org/2000/01/rdf-schema#label |
Messier 21
|
| gptkbp:locatedIn |
gptkb:Sagittarius
|
| gptkbp:mass |
783 solar masses
|
| gptkbp:partOf |
gptkb:Milky_Way
|
| gptkbp:rightAscension |
18h 04m 13s
|
| gptkbp:star |
~57
|
| gptkbp:bfsParent |
gptkb:Sagittarius_constellation_region
gptkb:M21 |
| gptkbp:bfsLayer |
7
|