Properties (22)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
star cluster
|
| gptkbp:age |
approximately 220 million years
|
| gptkbp:contains |
about 100 stars
|
| gptkbp:established |
John Herschel
|
| gptkbp:exhibits |
gptkb:Messier_21
Messier catalog |
| gptkbp:hasRecognition |
6.0
5.9 |
| gptkbp:hasSibling |
ongoing
|
| gptkbp:hasVariants |
-23° 10' 00"
|
| https://www.w3.org/2000/01/rdf-schema#label |
M21
|
| gptkbp:isAccessibleBy |
gptkb:Northern_Hemisphere
gptkb:Southern_Hemisphere |
| gptkbp:isAssociatedWith |
M20_(Trifid_Nebula)
|
| gptkbp:isFiledIn |
0.75
|
| gptkbp:isPartOf |
Milky Way galaxy
|
| gptkbp:legalStatus |
18h 03m 30s
|
| gptkbp:length |
approximately 4,000 light years
|
| gptkbp:locatedIn |
gptkb:Sagittarius_constellation
|
| gptkbp:releaseYear |
1830
|
| gptkbp:type |
various
open cluster |