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- Omicron_Ursae_Majoris abstract "Omicron Ursae Majoris (Omicron UMa, ο Ursae Majoris, ο UMa) is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.35 and is located at a distance of around 179 light-years (55 parsecs) from Earth. This star has the traditional name Muscida, which it shares with the optical double star Pi Ursae Majoris.The stellar classification of this star, G4 II–III, places it midway between the giant and bright giant stages of its evolution. The interferometry-measured angular diameter of this star is about 2.42 mas, which, at its estimated distance, equates to a physical radius of about 14 times the radius of the Sun. It has about three times the mass of the Sun and radiates 138 times the Sun's luminosity from its outer atmosphere at an effective temperature of 5,282 K, giving it the yellowish hue of a G-type star.In 1963, East German astronomer Gerhard Jakisch reported this star as a variable with a period of 358 days and an amplitude of 0.08 magnitude. The 1982 edition of the New Catalogue of Suspected Variable Stars listed it with a variability from 3.30 to 3.36 in the visual band. However, in 1992 American astronomer Dorrit Hoffleit noted that the two comparison stars used to determine the variability may themselves be variable. Hence the actual variability of this star may be suspect.Muscida has a magnitude 15.2 common proper motion companion at an angular separation of 7.1 arcseconds. With a probability of 99.4%, this companion is the source for the X-ray emission from the system. Omicron Ursae Majoris is sometimes listed with two more companions, but, based on proper motion data, these appear to be optical companions.This system is a member of the thin disk population and is following an orbit through the Milky Way galaxy with an eccentricity of 0.12. It comes as close to the Galactic Center as 23.5 kly (7.2 kpc) and as distant as 30.2 kly (9.3 kpc). This orbit carries it no more than about 330 ly (100 pc) above the galactic plane. It is considered a runaway star because it has a high peculiar velocity of 35.5 km s−1 relative to the typical motion of stars in its vicinity.In 2012, extrasolar planet Omicron Ursae Majoris Ab orbiting the primary at 3.9 astronomical units, was found. This gas giant (4.1 times as massive as Jupiter) completes orbit in 1630 days.".
- Omicron_Ursae_Majoris thumbnail Ursa_Major_IAU.svg?width=300.
- Omicron_Ursae_Majoris wikiPageID "2710781".
- Omicron_Ursae_Majoris wikiPageLength "12312".
- Omicron_Ursae_Majoris wikiPageOutDegree "60".
- Omicron_Ursae_Majoris wikiPageRevisionID "682214307".
- Omicron_Ursae_Majoris wikiPageWikiLink 16_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink 17_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink 23_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink 5_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink 6_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink Angular_diameter.
- Omicron_Ursae_Majoris wikiPageWikiLink Angular_distance.
- Omicron_Ursae_Majoris wikiPageWikiLink Angular_separation.
- Omicron_Ursae_Majoris wikiPageWikiLink Apparent_magnitude.
- Omicron_Ursae_Majoris wikiPageWikiLink Apparent_visual_magnitude.
- Omicron_Ursae_Majoris wikiPageWikiLink Arcsecond.
- Omicron_Ursae_Majoris wikiPageWikiLink Boss_General_Catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Bright_Star_Catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Bright_giant.
- Omicron_Ursae_Majoris wikiPageWikiLink Catalog_of_Components_of_Double_and_Multiple_Stars.
- Omicron_Ursae_Majoris wikiPageWikiLink Catalogues_of_Fundamental_Stars.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Bayer_objects.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Binary_stars.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Flamsteed_objects.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:G-type_giants.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Planetary_systems.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Stars_with_proper_names.
- Omicron_Ursae_Majoris wikiPageWikiLink Category:Ursa_Major_(constellation).
- Omicron_Ursae_Majoris wikiPageWikiLink Chinese_language.
- Omicron_Ursae_Majoris wikiPageWikiLink Circumpolar_constellation.
- Omicron_Ursae_Majoris wikiPageWikiLink Dorrit_Hoffleit.
- Omicron_Ursae_Majoris wikiPageWikiLink Double_star.
- Omicron_Ursae_Majoris wikiPageWikiLink Effective_temperature.
- Omicron_Ursae_Majoris wikiPageWikiLink Epoch_(astronomy).
- Omicron_Ursae_Majoris wikiPageWikiLink Fifth_Fundamental_Catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Galactic_Center.
- Omicron_Ursae_Majoris wikiPageWikiLink Galactic_plane.
- Omicron_Ursae_Majoris wikiPageWikiLink Giant_star.
- Omicron_Ursae_Majoris wikiPageWikiLink Glossary_of_astronomy.
- Omicron_Ursae_Majoris wikiPageWikiLink Henry_Draper_Catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Hipparcos.
- Omicron_Ursae_Majoris wikiPageWikiLink Interferometry.
- Omicron_Ursae_Majoris wikiPageWikiLink J2000.0.
- Omicron_Ursae_Majoris wikiPageWikiLink Milky_Way.
- Omicron_Ursae_Majoris wikiPageWikiLink Milliarcseconds.
- Omicron_Ursae_Majoris wikiPageWikiLink Minute_and_second_of_arc.
- Omicron_Ursae_Majoris wikiPageWikiLink Muscida.
- Omicron_Ursae_Majoris wikiPageWikiLink New_Catalogue_of_Suspected_Variable_Stars.
- Omicron_Ursae_Majoris wikiPageWikiLink Omicron_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink Omicron_Ursae_Majoris_Ab.
- Omicron_Ursae_Majoris wikiPageWikiLink Omicron_Ursae_Majoris_b.
- Omicron_Ursae_Majoris wikiPageWikiLink Optical_double.
- Omicron_Ursae_Majoris wikiPageWikiLink Orbital_eccentricity.
- Omicron_Ursae_Majoris wikiPageWikiLink PPM_Star_Catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Peculiar_velocity.
- Omicron_Ursae_Majoris wikiPageWikiLink Pi_Ursae_Majoris.
- Omicron_Ursae_Majoris wikiPageWikiLink Proper_motion.
- Omicron_Ursae_Majoris wikiPageWikiLink Purple_Forbidden_enclosure.
- Omicron_Ursae_Majoris wikiPageWikiLink Runaway_star.
- Omicron_Ursae_Majoris wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Omicron_Ursae_Majoris wikiPageWikiLink Solar_radius.
- Omicron_Ursae_Majoris wikiPageWikiLink Star_catalogue.
- Omicron_Ursae_Majoris wikiPageWikiLink Star_system.
- Omicron_Ursae_Majoris wikiPageWikiLink Stellar_atmosphere.
- Omicron_Ursae_Majoris wikiPageWikiLink Stellar_classification.
- Omicron_Ursae_Majoris wikiPageWikiLink Stellar_evolution.
- Omicron_Ursae_Majoris wikiPageWikiLink Stellar_kinematics.
- Omicron_Ursae_Majoris wikiPageWikiLink Thin_disk_population.
- Omicron_Ursae_Majoris wikiPageWikiLink Ursa_Major.
- Omicron_Ursae_Majoris wikiPageWikiLink Variable_star.
- Omicron_Ursae_Majoris wikiPageWikiLink Washington_Double_Star_Catalog.
- Omicron_Ursae_Majoris wikiPageWikiLinkText "Muscida".
- Omicron_Ursae_Majoris wikiPageWikiLinkText "Omicron Ursae Majoris".
- Omicron_Ursae_Majoris wikiPageWikiLinkText "ο UMa".
- Omicron_Ursae_Majoris wikiPageWikiLinkText "ο Ursae Majoris".
- Omicron_Ursae_Majoris absmagV "–0.40".
- Omicron_Ursae_Majoris ageMyr "360".
- Omicron_Ursae_Majoris appmagV "+3.35".
- Omicron_Ursae_Majoris bV "+0.85".
- Omicron_Ursae_Majoris class "G4 II–III".
- Omicron_Ursae_Majoris constell Ursa_Major.
- Omicron_Ursae_Majoris eccentricity "0.13".
- Omicron_Ursae_Majoris epoch Epoch_(astronomy).
- Omicron_Ursae_Majoris epoch J2000.0.
- Omicron_Ursae_Majoris exoplanet Omicron_Ursae_Majoris.
- Omicron_Ursae_Majoris exoplanet Omicron_Ursae_Majoris_b.
- Omicron_Ursae_Majoris gravity "2.64".
- Omicron_Ursae_Majoris hasPhotoCollection Omicron_Ursae_Majoris.
- Omicron_Ursae_Majoris luminosity "138".
- Omicron_Ursae_Majoris mass "3.09".
- Omicron_Ursae_Majoris metalFe "–0.09".
- Omicron_Ursae_Majoris pError "0.16".
- Omicron_Ursae_Majoris parallax "18.21".
- Omicron_Ursae_Majoris period "1630".
- Omicron_Ursae_Majoris propMoDec "–107.45".
- Omicron_Ursae_Majoris propMoRa "–133.76".
- Omicron_Ursae_Majoris radialV "+19.8".
- Omicron_Ursae_Majoris radius "14".
- Omicron_Ursae_Majoris rotationalVelocity "15".