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- Theta_Ursae_Majoris abstract "Theta Ursae Majoris (Theta UMa, θ Ursae Majoris, θ UMa) is a suspected spectroscopic binary star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of 3.17, placing it among the brighter members of this constellation. The distance to this star has been measured directly using the parallax method, yielding an estimated value of 43.96 light-years (13.48 parsecs).In 1976, this was reported as a spectroscopic binary system by Helmut A. Abt and Saul G. Levy, giving it an orbital period of 371 days. This has been listed as a spectroscopic binary system with an orbital period of 371 days. However, this was brought into question by Christopher L. Morbey and Roger F. Griffin in 1987, who suggested that the data could be explained by random chance. Further observations in 2009 with observations with the Bok Telescope in Arizona did show changes of 180 m/s in radial velocity, although there was not sufficient evidence to support a Keplerian orbit. There is a 14th-magnitude common proper motion companion to Theta Ursae Majoris at an angular separation of 4.1 arcseconds, so this may potentially be a triple star system.The primary component of this putative system has a published stellar classification of F6 IV, indicating it is a subgiant star that is evolving away from the main sequence. In 2009, Helmut A. Abt listed it with a stellar classification of F7 V, suggesting that it is still on the main sequence. It is larger than the Sun with 141% of the Sun's mass and 250% of the Sun's radius. Consequently it is shining brighter and evolving more rapidly than the Sun, with a luminosity nearly eight times the Sun's at an age of 2.2 billion years. This energy is being radiated from the star's outer atmosphere at an effective temperature of 6,300 K. At this heat, the star glows with the yellow-white hue of an F-type star.The McDonald Observatory team has set limits to the hypothetical presence of one or more planets around the primary with masses between 0.24 and 4.6 Jupiter masses and average separations spanning between 0.05 and 5.2 AU.".
- Theta_Ursae_Majoris thumbnail Ursa_Major_IAU.svg?width=300.
- Theta_Ursae_Majoris wikiPageID "2710462".
- Theta_Ursae_Majoris wikiPageLength "12391".
- Theta_Ursae_Majoris wikiPageOutDegree "51".
- Theta_Ursae_Majoris wikiPageRevisionID "701669274".
- Theta_Ursae_Majoris wikiPageWikiLink 15_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink 18_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink 23_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink Angular_distance.
- Theta_Ursae_Majoris wikiPageWikiLink Apparent_magnitude.
- Theta_Ursae_Majoris wikiPageWikiLink Asterism_(astronomy).
- Theta_Ursae_Majoris wikiPageWikiLink Astronomical_unit.
- Theta_Ursae_Majoris wikiPageWikiLink Binary_star.
- Theta_Ursae_Majoris wikiPageWikiLink Bok_Telescope.
- Theta_Ursae_Majoris wikiPageWikiLink Boss_General_Catalogue.
- Theta_Ursae_Majoris wikiPageWikiLink Bright_Star_Catalogue.
- Theta_Ursae_Majoris wikiPageWikiLink Catalog_of_Components_of_Double_and_Multiple_Stars.
- Theta_Ursae_Majoris wikiPageWikiLink Catalogues_of_Fundamental_Stars.
- Theta_Ursae_Majoris wikiPageWikiLink Category:Bayer_objects.
- Theta_Ursae_Majoris wikiPageWikiLink Category:Binary_stars.
- Theta_Ursae_Majoris wikiPageWikiLink Category:F-type_subgiants.
- Theta_Ursae_Majoris wikiPageWikiLink Category:Stars_with_proper_names.
- Theta_Ursae_Majoris wikiPageWikiLink Category:Ursa_Major_(constellation).
- Theta_Ursae_Majoris wikiPageWikiLink Chinese_language.
- Theta_Ursae_Majoris wikiPageWikiLink Circumpolar_constellation.
- Theta_Ursae_Majoris wikiPageWikiLink Effective_temperature.
- Theta_Ursae_Majoris wikiPageWikiLink Glossary_of_astronomy.
- Theta_Ursae_Majoris wikiPageWikiLink Henry_Draper_Catalogue.
- Theta_Ursae_Majoris wikiPageWikiLink Hipparcos.
- Theta_Ursae_Majoris wikiPageWikiLink Index_Catalogue_of_Visual_Double_Stars.
- Theta_Ursae_Majoris wikiPageWikiLink Jupiter_mass.
- Theta_Ursae_Majoris wikiPageWikiLink Kepler_orbit.
- Theta_Ursae_Majoris wikiPageWikiLink Main_sequence.
- Theta_Ursae_Majoris wikiPageWikiLink McDonald_Observatory.
- Theta_Ursae_Majoris wikiPageWikiLink Minute_and_second_of_arc.
- Theta_Ursae_Majoris wikiPageWikiLink PPM_Star_Catalogue.
- Theta_Ursae_Majoris wikiPageWikiLink Parallax.
- Theta_Ursae_Majoris wikiPageWikiLink Phi_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink Purple_Forbidden_enclosure.
- Theta_Ursae_Majoris wikiPageWikiLink Radial_velocity.
- Theta_Ursae_Majoris wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Theta_Ursae_Majoris wikiPageWikiLink Star_catalogue.
- Theta_Ursae_Majoris wikiPageWikiLink Stellar_atmosphere.
- Theta_Ursae_Majoris wikiPageWikiLink Stellar_classification.
- Theta_Ursae_Majoris wikiPageWikiLink Stellar_evolution.
- Theta_Ursae_Majoris wikiPageWikiLink Subgiant.
- Theta_Ursae_Majoris wikiPageWikiLink Tau_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink Upsilon_Ursae_Majoris.
- Theta_Ursae_Majoris wikiPageWikiLink Ursa_Major.
- Theta_Ursae_Majoris wikiPageWikiLink Washington_Double_Star_Catalog.
- Theta_Ursae_Majoris wikiPageWikiLinkText "Sarir".
- Theta_Ursae_Majoris wikiPageWikiLinkText "Theta Ursae Majoris".
- Theta_Ursae_Majoris wikiPageWikiLinkText "θ UMa".
- Theta_Ursae_Majoris wikiPageWikiLinkText "θ Ursae Majoris".
- Theta_Ursae_Majoris wikiPageWikiLinkText "θ".
- Theta_Ursae_Majoris absmagV "2.43".
- Theta_Ursae_Majoris ageGyr "2.2".
- Theta_Ursae_Majoris appmagV "3.166".
- Theta_Ursae_Majoris bV "+0.46".
- Theta_Ursae_Majoris class "F6 IV".
- Theta_Ursae_Majoris constell Ursa_Major.
- Theta_Ursae_Majoris epoch "J2000".
- Theta_Ursae_Majoris gravity "3.8".
- Theta_Ursae_Majoris luminosity "7.871".
- Theta_Ursae_Majoris mass "1.41".
- Theta_Ursae_Majoris metalFe "–0.18 ± 0.07".
- Theta_Ursae_Majoris pError "0.14".
- Theta_Ursae_Majoris parallax "74.19".
- Theta_Ursae_Majoris propMoDec "-535.6".
- Theta_Ursae_Majoris propMoRa "-947.46".
- Theta_Ursae_Majoris radialV "+14.6".
- Theta_Ursae_Majoris radius "2.365".
- Theta_Ursae_Majoris rotationalVelocity "6.8".
- Theta_Ursae_Majoris temperature "6300".
- Theta_Ursae_Majoris uB "+0.03".
- Theta_Ursae_Majoris variable "Suspected".
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Convert.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:DEC.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Lang-en.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Location_map.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Nearest_star_systems.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:RA.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Reflist.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_astrometry.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_begin.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_catalog.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_character.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_detail.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_end.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_image.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_observe.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Starbox_reference.
- Theta_Ursae_Majoris wikiPageUsesTemplate Template:Stars_of_Ursa_Major.
- Theta_Ursae_Majoris subject Category:Bayer_objects.
- Theta_Ursae_Majoris subject Category:Binary_stars.
- Theta_Ursae_Majoris subject Category:F-type_subgiants.
- Theta_Ursae_Majoris subject Category:Stars_with_proper_names.
- Theta_Ursae_Majoris subject Category:Ursa_Major_(constellation).
- Theta_Ursae_Majoris hypernym System.