|
gptkbp:instanceOf
|
gptkb:galaxy
|
|
gptkbp:alsoKnownAs
|
gptkb:M81
gptkb:NGC_3031
|
|
gptkbp:angularSize
|
26.9 × 14.1 arcminutes
|
|
gptkbp:apparentMagnitude
|
6.94
|
|
gptkbp:bestViewedIn
|
gptkb:spring
|
|
gptkbp:cataloguedIn
|
gptkb:Messier_Catalogue
gptkb:New_General_Catalogue
|
|
gptkbp:contains
|
black hole
|
|
gptkbp:declination
|
+69° 03′ 55″
|
|
gptkbp:diameter
|
about 90,000 light-years
|
|
gptkbp:discoveredBy
|
gptkb:Johann_Elert_Bode
|
|
gptkbp:discoveredIn
|
1774
|
|
gptkbp:distanceFromEarth
|
about 12 million light-years
|
|
gptkbp:featuredIn
|
Hubble Space Telescope images
|
|
gptkbp:galaxyType
|
SA(s)ab
|
|
gptkbp:hasCompanion
|
gptkb:NGC_3077
gptkb:Messier_82
|
|
gptkbp:hasViewOf
|
gptkb:Northern_Hemisphere
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Messier 81
|
|
gptkbp:locatedIn
|
gptkb:Ursa_Major
|
|
gptkbp:mass
|
~250 billion solar masses
|
|
gptkbp:notableFeature
|
active galactic nucleus
prominent spiral arms
|
|
gptkbp:partOf
|
gptkb:M81_Group
|
|
gptkbp:redshift
|
-0.000113
|
|
gptkbp:rightAscension
|
09h 55m 33.2s
|
|
gptkbp:studiedBy
|
gptkb:galaxy
star formation
|
|
gptkbp:supernovaDate
|
1993
|
|
gptkbp:supernovaeObserved
|
gptkb:SN_1993J
|
|
gptkbp:bfsParent
|
gptkb:The_Great_Bear
gptkb:Charles_Messier
gptkb:Johann_Elert_Bode
gptkb:Ursa_Major
|
|
gptkbp:bfsLayer
|
6
|