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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 wikiPageRevisionID "601551350".
- 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 hasPhotoCollection Theta_Ursae_Majoris.
- Theta_Ursae_Majoris mass "1.41".
- 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 rotationalVelocity "6.8".
- Theta_Ursae_Majoris uB "+0.03".
- Theta_Ursae_Majoris variable "Suspected".
- 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:Objects_within_100_ly_of_Earth.
- Theta_Ursae_Majoris subject Category:Stars_with_proper_names.
- Theta_Ursae_Majoris subject Category:Ursa_Major_(constellation).
- Theta_Ursae_Majoris type BayerObjects.
- Theta_Ursae_Majoris type BinaryStar109221070.
- Theta_Ursae_Majoris type BinaryStars.
- Theta_Ursae_Majoris type CelestialBody109239740.
- Theta_Ursae_Majoris type NaturalObject100019128.
- Theta_Ursae_Majoris type Object100002684.
- Theta_Ursae_Majoris type PhysicalEntity100001930.
- Theta_Ursae_Majoris type Star109444100.
- Theta_Ursae_Majoris type StarsWithProperNames.
- Theta_Ursae_Majoris type Whole100003553.
- Theta_Ursae_Majoris type CelestialBody.
- Theta_Ursae_Majoris type Star.
- Theta_Ursae_Majoris type PhysicalBody.
- Theta_Ursae_Majoris comment "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.".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "Theta Ursae Majoris".
- Theta_Ursae_Majoris label "文昌四".
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs 큰곰자리_세타.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris sameAs m.07zfvq.
- Theta_Ursae_Majoris sameAs Q1327688.
- Theta_Ursae_Majoris sameAs Q1327688.
- Theta_Ursae_Majoris sameAs Theta_Ursae_Majoris.
- Theta_Ursae_Majoris wasDerivedFrom Theta_Ursae_Majoris?oldid=601551350.
- Theta_Ursae_Majoris depiction Ursa_Major_IAU.svg.
- Theta_Ursae_Majoris isPrimaryTopicOf Theta_Ursae_Majoris.
- Theta_Ursae_Majoris name "Theta Ursae Majoris".