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• Xi_Ursae_Majoris abstract "Xi Ursae Majoris (Xi UMa, ξ Ursae Majoris, ξ UMa) is a star system in the constellation Ursa Major. On May 2, 1780, Sir William Herschel discovered that this was a binary star system, making it the first such system ever discovered. It was the first visual double star for which an orbit was calculated, when it was computed by Félix Savary in 1828.The two components are yellow G-type main-sequence stars. The brighter component, Xi Ursae Majoris A, has a mean apparent magnitude of +4.41. It is classified as an RS Canum Venaticorum type variable star and its brightness varies by 0.01 magnitudes. The companion star, Xi Ursae Majoris B has an apparent magnitude of +4.87. The orbital period of the two stars is 59.84 years, and they are currently separated by 1.2 arcseconds, or at least 10 AUs.Each component of this double star is itself a spectroscopic binary. B's binary companion, denoted Xi Ursae Majoris Bb, is unresolved, but the binary star is known to have an orbital period of 3.98 days. The masses of both A and B's companions (Ab and Bb) (deduced by the sum total mass of the system minus the likely masses of Aa and Ba determined by their class) indicate that they are probably MV stars (red dwarfs), Bb being on the cool end of the M spectrum, not much hotter than a brown dwarf.It also has the proper name Alula Australis (and erroneously Alula Australe).".
• Xi_Ursae_Majoris thumbnail Ursa_Major_constellation_map.svg?width=300.
• Xi_Ursae_Majoris wikiPageExternalLink alulaaus.html.
• Xi_Ursae_Majoris wikiPageExternalLink aluaussys.htm.
• Xi_Ursae_Majoris wikiPageExternalLink alulaaus.htm.
• Xi_Ursae_Majoris wikiPageID "2711415".
• Xi_Ursae_Majoris wikiPageRevisionID "602286092".
• Xi_Ursae_Majoris absmagV "4.71".
• Xi_Ursae_Majoris age "6".
• Xi_Ursae_Majoris appmagV "3.79".
• Xi_Ursae_Majoris axis "2.536".
• Xi_Ursae_Majoris bV "0.59".
• Xi_Ursae_Majoris class "G0 Ve/G0 Ve".
• Xi_Ursae_Majoris constell Ursa_Major.
• Xi_Ursae_Majoris dec "+31° 31′ 45″".
• Xi_Ursae_Majoris eccentricity "0.398".
• Xi_Ursae_Majoris epoch "J2000".
• Xi_Ursae_Majoris hasPhotoCollection Xi_Ursae_Majoris.
• Xi_Ursae_Majoris inclination "127.94".
• Xi_Ursae_Majoris luminosity "1.1".
• Xi_Ursae_Majoris mass "1.05".
• Xi_Ursae_Majoris metal "0.98".
• Xi_Ursae_Majoris name "ξ UMa A".
• Xi_Ursae_Majoris node "101.85".
• Xi_Ursae_Majoris pError "4.6".
• Xi_Ursae_Majoris parallax "113.2".
• Xi_Ursae_Majoris periastron "1935.195".
• Xi_Ursae_Majoris period "59.878".
• Xi_Ursae_Majoris propMoDec "-587".
• Xi_Ursae_Majoris propMoRa "-429".
• Xi_Ursae_Majoris ra "40691.0".
• Xi_Ursae_Majoris radialV "-15".
• Xi_Ursae_Majoris radius "1.01".
• Xi_Ursae_Majoris rotation "3.0".
• Xi_Ursae_Majoris temperature "~5,900/5,900".
• Xi_Ursae_Majoris uB "0.04".
• Xi_Ursae_Majoris variable "?".
• Xi_Ursae_Majoris subject Category:Bayer_objects.
• Xi_Ursae_Majoris subject Category:G-type_main-sequence_stars.
• Xi_Ursae_Majoris subject Category:Gliese_and_GJ_objects.
• Xi_Ursae_Majoris subject Category:M-type_main-sequence_stars.
• Xi_Ursae_Majoris subject Category:Multiple_star_systems.
• Xi_Ursae_Majoris subject Category:Objects_within_100_ly_of_Earth.
• Xi_Ursae_Majoris subject Category:RS_Canum_Venaticorum_variables.
• Xi_Ursae_Majoris subject Category:Solar-type_stars.
• Xi_Ursae_Majoris subject Category:Spectroscopic_binaries.
• Xi_Ursae_Majoris subject Category:Stars_with_proper_names.
• Xi_Ursae_Majoris subject Category:T-type_stars.
• Xi_Ursae_Majoris subject Category:Ursa_Major_(constellation).
• Xi_Ursae_Majoris subject Category:WISE_objects.
• Xi_Ursae_Majoris type BayerObjects.
• Xi_Ursae_Majoris type BinaryStar109221070.
• Xi_Ursae_Majoris type CelestialBody109239740.
• Xi_Ursae_Majoris type G-typeMainSequenceStars.
• Xi_Ursae_Majoris type NaturalObject100019128.
• Xi_Ursae_Majoris type Object100002684.
• Xi_Ursae_Majoris type PhysicalEntity100001930.
• Xi_Ursae_Majoris type RSCanumVenaticorumVariables.
• Xi_Ursae_Majoris type SpectroscopicBinaries.
• Xi_Ursae_Majoris type Star109444100.
• Xi_Ursae_Majoris type StarsWithProperNames.
• Xi_Ursae_Majoris type Thing100002452.
• Xi_Ursae_Majoris type Variable109468959.
• Xi_Ursae_Majoris type Whole100003553.
• Xi_Ursae_Majoris type CelestialBody.
• Xi_Ursae_Majoris type Star.
• Xi_Ursae_Majoris type PhysicalBody.
• Xi_Ursae_Majoris comment "Xi Ursae Majoris (Xi UMa, ξ Ursae Majoris, ξ UMa) is a star system in the constellation Ursa Major. On May 2, 1780, Sir William Herschel discovered that this was a binary star system, making it the first such system ever discovered. It was the first visual double star for which an orbit was calculated, when it was computed by Félix Savary in 1828.The two components are yellow G-type main-sequence stars. The brighter component, Xi Ursae Majoris A, has a mean apparent magnitude of +4.41.".
• Xi_Ursae_Majoris label "Alula Australis".
• Xi_Ursae_Majoris label "Alula Australis".
• Xi_Ursae_Majoris label "Ksi Ursae Majoris".
• Xi_Ursae_Majoris label "Xi Ursae Majoris".
• Xi_Ursae_Majoris label "Xi Ursae Majoris".
• Xi_Ursae_Majoris label "Xi Ursae Majoris".
• Xi_Ursae_Majoris label "Xi Ursae Majoris".
• Xi_Ursae_Majoris label "Xi Ursae Majoris".
• Xi_Ursae_Majoris label "Алула Южная".
• Xi_Ursae_Majoris label "القفزة الأولى الجنوبي".
• Xi_Ursae_Majoris label "下台二".
• Xi_Ursae_Majoris sameAs Xi_Ursae_Majoris.
• Xi_Ursae_Majoris sameAs Alula_Australis.
• Xi_Ursae_Majoris sameAs Xi_Ursae_Majoris.
• Xi_Ursae_Majoris sameAs Xi_Ursae_Majoris.
• Xi_Ursae_Majoris sameAs 큰곰자리_크시.
• Xi_Ursae_Majoris sameAs Alula_Australis.
• Xi_Ursae_Majoris sameAs Ksi_Ursae_Majoris.
• Xi_Ursae_Majoris sameAs Xi_Ursae_Majoris.
• Xi_Ursae_Majoris sameAs m.07zhvp.
• Xi_Ursae_Majoris sameAs Q1072624.
• Xi_Ursae_Majoris sameAs Q1072624.
• Xi_Ursae_Majoris sameAs Xi_Ursae_Majoris.
• Xi_Ursae_Majoris wasDerivedFrom Xi_Ursae_Majoris?oldid=602286092.
• Xi_Ursae_Majoris depiction Ursa_Major_constellation_map.svg.
• Xi_Ursae_Majoris isPrimaryTopicOf Xi_Ursae_Majoris.
• Xi_Ursae_Majoris name "Xi Ursae Majoris".