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- H1821+643 abstract "H1821+643 is a quasar situated within the constellation of Draco. It is situated in a massive, strong cooling flow cluster. Astronomers in 2014 identified H1821+643 as the most massive black hole with a precisely measured mass, at 30 billion solar masses. Several other black holes are possibly more massive, but they have less accurate mass estimates. The Schwarzschild diameter of this black hole is about 172 billion kilometres, 28 times the diameter of Pluto's orbit.".
- H1821+643 wikiPageID "47021524".
- H1821+643 wikiPageLength "1669".
- H1821+643 wikiPageOutDegree "15".
- H1821+643 wikiPageRevisionID "669009378".
- H1821+643 wikiPageWikiLink Category:Draco_(constellation).
- H1821+643 wikiPageWikiLink Category:Quasars.
- H1821+643 wikiPageWikiLink Category:Supermassive_black_holes.
- H1821+643 wikiPageWikiLink Constellation.
- H1821+643 wikiPageWikiLink Cooling_flow.
- H1821+643 wikiPageWikiLink Draco_(constellation).
- H1821+643 wikiPageWikiLink Light-year.
- H1821+643 wikiPageWikiLink List_of_most_massive_black_holes.
- H1821+643 wikiPageWikiLink Parsec.
- H1821+643 wikiPageWikiLink Pluto.
- H1821+643 wikiPageWikiLink Quasar.
- H1821+643 wikiPageWikiLink Schwarzschild_radius.
- H1821+643 wikiPageWikiLink Solar_mass.
- H1821+643 wikiPageWikiLinkText "H1821+643".
- H1821+643 appmagV "14.24".
- H1821+643 constellationName Draco_(constellation).
- H1821+643 distLy "3400000000".
- H1821+643 epoch "J2000.0".
- H1821+643 hasPhotoCollection H1821+643.
- H1821+643 name "SDSS J182157.2+642036".
- H1821+643 type Quasar.
- H1821+643 wikiPageUsesTemplate Template:Astronomy-stub.
- H1821+643 wikiPageUsesTemplate Template:Infobox_quasar.
- H1821+643 wikiPageUsesTemplate Template:Reflist.
- H1821+643 z "0.297".
- H1821+643 subject Category:Draco_(constellation).
- H1821+643 subject Category:Quasars.
- H1821+643 subject Category:Supermassive_black_holes.
- H1821+643 hypernym Quasar.
- H1821+643 type Galaxy.
- H1821+643 comment "H1821+643 is a quasar situated within the constellation of Draco. It is situated in a massive, strong cooling flow cluster. Astronomers in 2014 identified H1821+643 as the most massive black hole with a precisely measured mass, at 30 billion solar masses. Several other black holes are possibly more massive, but they have less accurate mass estimates. The Schwarzschild diameter of this black hole is about 172 billion kilometres, 28 times the diameter of Pluto's orbit.".
- H1821+643 label "H1821+643".
- H1821+643 sameAs m.013f8ryz.
- H1821+643 wasDerivedFrom H1821+643?oldid=669009378.
- H1821+643 isPrimaryTopicOf H1821+643.