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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 AU.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 wikiPageLength "7891".
• Xi_Ursae_Majoris wikiPageOutDegree "50".
• Xi_Ursae_Majoris wikiPageRevisionID "701075049".
• Xi_Ursae_Majoris wikiPageWikiLink 1828_in_science.
• Xi_Ursae_Majoris wikiPageWikiLink Apparent_magnitude.
• Xi_Ursae_Majoris wikiPageWikiLink Astronomical_unit.
• Xi_Ursae_Majoris wikiPageWikiLink Binary_star.
• Xi_Ursae_Majoris wikiPageWikiLink Boss_General_Catalogue.
• Xi_Ursae_Majoris wikiPageWikiLink Bright_Star_Catalogue.
• Xi_Ursae_Majoris wikiPageWikiLink Catalog_of_Components_of_Double_and_Multiple_Stars.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Bayer_objects.
• Xi_Ursae_Majoris wikiPageWikiLink Category:G-type_main-sequence_stars.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Gliese_and_GJ_objects.
• Xi_Ursae_Majoris wikiPageWikiLink Category:M-type_main-sequence_stars.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Multiple_star_systems.
• Xi_Ursae_Majoris wikiPageWikiLink Category:RS_Canum_Venaticorum_variables.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Solar-type_stars.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Spectroscopic_binaries.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Stars_with_proper_names.
• Xi_Ursae_Majoris wikiPageWikiLink Category:T-type_stars.
• Xi_Ursae_Majoris wikiPageWikiLink Category:Ursa_Major_(constellation).
• Xi_Ursae_Majoris wikiPageWikiLink Category:WISE_objects.
• Xi_Ursae_Majoris wikiPageWikiLink Chinese_language.
• Xi_Ursae_Majoris wikiPageWikiLink Constellation.
• Xi_Ursae_Majoris wikiPageWikiLink Félix_Savary.
• Xi_Ursae_Majoris wikiPageWikiLink G-type_main-sequence_star.
• Xi_Ursae_Majoris wikiPageWikiLink Henry_Draper_Catalogue.
• Xi_Ursae_Majoris wikiPageWikiLink Hipparcos.
• Xi_Ursae_Majoris wikiPageWikiLink Index_Catalogue_of_Visual_Double_Stars.
• Xi_Ursae_Majoris wikiPageWikiLink Iota_Ursae_Majoris.
• Xi_Ursae_Majoris wikiPageWikiLink Kappa_Ursae_Majoris.
• Xi_Ursae_Majoris wikiPageWikiLink Lambda_Ursae_Majoris.
• Xi_Ursae_Majoris wikiPageWikiLink Latin.
• Xi_Ursae_Majoris wikiPageWikiLink Minute_and_second_of_arc.
• Xi_Ursae_Majoris wikiPageWikiLink Mu_Ursae_Majoris.
• Xi_Ursae_Majoris wikiPageWikiLink Nu_Ursae_Majoris.
• Xi_Ursae_Majoris wikiPageWikiLink Purple_Forbidden_enclosure.
• Xi_Ursae_Majoris wikiPageWikiLink RS_Canum_Venaticorum_variable.
• Xi_Ursae_Majoris wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
• Xi_Ursae_Majoris wikiPageWikiLink Star_catalogue.
• Xi_Ursae_Majoris wikiPageWikiLink Star_system.
• Xi_Ursae_Majoris wikiPageWikiLink Ursa_Major.
• Xi_Ursae_Majoris wikiPageWikiLink Variable_star.
• Xi_Ursae_Majoris wikiPageWikiLink Washington_Double_Star_Catalog.
• Xi_Ursae_Majoris wikiPageWikiLink Wide-field_Infrared_Survey_Explorer.
• Xi_Ursae_Majoris wikiPageWikiLink William_Herschel.
• Xi_Ursae_Majoris wikiPageWikiLink File:Xi_UMa_orbit.gif.
• Xi_Ursae_Majoris wikiPageWikiLinkText "Alula Australis".
• Xi_Ursae_Majoris wikiPageWikiLinkText "Ursæ Majoris".
• Xi_Ursae_Majoris wikiPageWikiLinkText "Xi Ursae Majoris B".
• Xi_Ursae_Majoris wikiPageWikiLinkText "Xi Ursae Majoris".
• Xi_Ursae_Majoris wikiPageWikiLinkText "Xi Ursae Majoris#WISE J111838.70+312537.9".
• Xi_Ursae_Majoris wikiPageWikiLinkText "ξ UMa A".
• Xi_Ursae_Majoris wikiPageWikiLinkText "ξ UMa B".
• Xi_Ursae_Majoris wikiPageWikiLinkText "ξ UMa".
• Xi_Ursae_Majoris wikiPageWikiLinkText "ξ Ursae Majoris".
• Xi_Ursae_Majoris wikiPageWikiLinkText "ξ".
• 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 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 "−15.0".
• Xi_Ursae_Majoris radius "1.01".
• Xi_Ursae_Majoris rotation "3.0".
• Xi_Ursae_Majoris simbad "**+WTE+1".
• Xi_Ursae_Majoris simbad "2".
• Xi_Ursae_Majoris simbad "HD+98230b".
• Xi_Ursae_Majoris simbad "TYC+2520-2634-1".
• Xi_Ursae_Majoris simbad "TYC+2520-2634-2".
• Xi_Ursae_Majoris simbad "xi.+UMa".
• Xi_Ursae_Majoris sn "Aab".
• Xi_Ursae_Majoris sn "AabBab".
• Xi_Ursae_Majoris sn "Bab".
• Xi_Ursae_Majoris sn "Bb".
• Xi_Ursae_Majoris sn "The system".

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