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- Messier_21 abstract "Messier 21 or M21 (also designated NGC 6531) is an open cluster of stars in the constellation of Sagittarius. It was discovered and catalogued by Charles Messier on June 5, 1764.M21 is a relatively young cluster of a mere 4.6 million years of age. It is tightly packed but contains about 57 stars. A few blue giant stars have been identified in the cluster, but Messier 21 is composed mainly of small dim stars. With a magnitude of 6.5, M21 is not visible to the naked eye; however, with the smallest binoculars it can be easily spotted on a dark night.".
- Messier_21 thumbnail Messier_object_021.jpg?width=300.
- Messier_21 wikiPageExternalLink m021.html.
- Messier_21 wikiPageID "960583".
- Messier_21 wikiPageLength "1545".
- Messier_21 wikiPageOutDegree "14".
- Messier_21 wikiPageRevisionID "669473492".
- Messier_21 wikiPageWikiLink Category:Astronomical_objects_discovered_in_1764.
- Messier_21 wikiPageWikiLink Category:Carina–Sagittarius_Arm.
- Messier_21 wikiPageWikiLink Category:Messier_objects.
- Messier_21 wikiPageWikiLink Category:NGC_objects.
- Messier_21 wikiPageWikiLink Category:Open_clusters.
- Messier_21 wikiPageWikiLink Category:Sagittarius_(constellation).
- Messier_21 wikiPageWikiLink Charles_Messier.
- Messier_21 wikiPageWikiLink Constellation.
- Messier_21 wikiPageWikiLink Light-year.
- Messier_21 wikiPageWikiLink Light_year.
- Messier_21 wikiPageWikiLink Open_cluster.
- Messier_21 wikiPageWikiLink Sagittarius_(constellation).
- Messier_21 wikiPageWikiLink Star.
- Messier_21 wikiPageWikiLink File:M21map.png.
- Messier_21 wikiPageWikiLink File:Messier_object_021.jpg.
- Messier_21 wikiPageWikiLinkText "M21".
- Messier_21 wikiPageWikiLinkText "Messier 21".
- Messier_21 age "1.4516496E14".
- Messier_21 appmagV "6.5".
- Messier_21 class "180.0".
- Messier_21 dec "−22° 30′".
- Messier_21 distLy "4.25".
- Messier_21 distPc "1.3".
- Messier_21 epoch "J2000.0".
- Messier_21 hasPhotoCollection Messier_21.
- Messier_21 name "Messier 21".
- Messier_21 names "NGC 6531".
- Messier_21 ra "65076.0".
- Messier_21 sizeV "13".
- Messier_21 wikiPageUsesTemplate Template:Infobox_open_cluster.
- Messier_21 wikiPageUsesTemplate Template:Messier_objects.
- Messier_21 wikiPageUsesTemplate Template:Sky.
- Messier_21 wikiPageUsesTemplate Template:Star-cluster-stub.
- Messier_21 wikiPageUsesTemplate Template:WikiSky.
- Messier_21 subject Category:Astronomical_objects_discovered_in_1764.
- Messier_21 subject Category:Carina–Sagittarius_Arm.
- Messier_21 subject Category:Messier_objects.
- Messier_21 subject Category:NGC_objects.
- Messier_21 subject Category:Open_clusters.
- Messier_21 subject Category:Sagittarius_(constellation).
- Messier_21 hypernym Cluster.
- Messier_21 type Language.
- Messier_21 type Catalogue.
- Messier_21 type Object.
- Messier_21 comment "Messier 21 or M21 (also designated NGC 6531) is an open cluster of stars in the constellation of Sagittarius. It was discovered and catalogued by Charles Messier on June 5, 1764.M21 is a relatively young cluster of a mere 4.6 million years of age. It is tightly packed but contains about 57 stars. A few blue giant stars have been identified in the cluster, but Messier 21 is composed mainly of small dim stars.".
- Messier_21 label "Messier 21".
- Messier_21 sameAs Messier_21.
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- Messier_21 sameAs NGC_6531.
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- Messier_21 sameAs M21.
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- Messier_21 sameAs Messier_21.
- Messier_21 sameAs M21.
- Messier_21 sameAs M21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs M21_(astronomia).
- Messier_21 sameAs M21_(天体).
- Messier_21 sameAs 메시에_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Mesjė_21.
- Messier_21 sameAs മെസ്സിയർ_21.
- Messier_21 sameAs مسیه_۲۱.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs m.03tkvn.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs M_21_(рассеянное_скопление).
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Месје_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Мессьє_21.
- Messier_21 sameAs Messier_21.
- Messier_21 sameAs Q11383.
- Messier_21 sameAs Q11383.
- Messier_21 sameAs M21_(疏散星團).
- Messier_21 wasDerivedFrom Messier_21?oldid=669473492.
- Messier_21 depiction Messier_object_021.jpg.
- Messier_21 isPrimaryTopicOf Messier_21.