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- Theta_Coronae_Borealis abstract "Theta Coronae Borealis (θ CrB) is a binary star system in the constellation Corona Borealis. It shines with a combined apparent visual magnitude (V band) of 4.13. There are two components: Theta Coronae Borealis A is of apparent magnitude 4.16, while Theta Coronae Borealis B lies around 1 arcsecond distant and has an apparent magnitude of 6.29. The system is located around 375 light-years from Earth, as estimated from its parallax of 8.69 milliarcseconds. It is estimated to be 85 million years old, with the primary star expected to remain on the main sequence burning its core hydrogen for another 75 million years and the secondary around 500 million years. Both stars will cool and expand once their core hydrogen is exhausted, becoming red giants. The brighter component, Theta Coronae Borealis A, is a blue-white star that spins extremely rapidly—at a rate of around 393 km per second. This rapid spinning is thought to be the cause of a gaseous disk that surrounds the star: such stars are known as Be stars, recognizable because the gas radiates emission lines that give a characteristic pattern in the star's spectrum. Of spectral type B6Vnn, Theta Coronae Borealis A is around six times as massive as the Sun and has four times the diameter. It has a surface temperature of around 14910 K. In 1970, it faded by 0.7 magnitude, becoming 50% fainter. The cause for this is unknown, but thought possibly due to ejection of dust that obscured the star's light.Theta Coronae Borealis B is a white main sequence star of spectral type A2V that is around 2.5 times as massive as the Sun and located 86 astronomical units from the primary star, the two stars taking an estimated 300 years to orbit around a common centre of gravity.".
- Theta_Coronae_Borealis wikiPageID "36966931".
- Theta_Coronae_Borealis wikiPageLength "4881".
- Theta_Coronae_Borealis wikiPageOutDegree "23".
- Theta_Coronae_Borealis wikiPageRevisionID "661636969".
- Theta_Coronae_Borealis wikiPageWikiLink A-type_main-sequence_star.
- Theta_Coronae_Borealis wikiPageWikiLink Apparent_magnitude.
- Theta_Coronae_Borealis wikiPageWikiLink Astronomical_unit.
- Theta_Coronae_Borealis wikiPageWikiLink Barycenter.
- Theta_Coronae_Borealis wikiPageWikiLink Bayer_designation.
- Theta_Coronae_Borealis wikiPageWikiLink Binary_star.
- Theta_Coronae_Borealis wikiPageWikiLink Category:Bayer_objects.
- Theta_Coronae_Borealis wikiPageWikiLink Category:Be_stars.
- Theta_Coronae_Borealis wikiPageWikiLink Category:Corona_Borealis_(constellation).
- Theta_Coronae_Borealis wikiPageWikiLink Constellation.
- Theta_Coronae_Borealis wikiPageWikiLink Corona_Borealis.
- Theta_Coronae_Borealis wikiPageWikiLink Epoch_(astronomy).
- Theta_Coronae_Borealis wikiPageWikiLink Henry_Draper_Catalogue.
- Theta_Coronae_Borealis wikiPageWikiLink Hipparcos.
- Theta_Coronae_Borealis wikiPageWikiLink International_Celestial_Reference_System.
- Theta_Coronae_Borealis wikiPageWikiLink Light-year.
- Theta_Coronae_Borealis wikiPageWikiLink Main_sequence.
- Theta_Coronae_Borealis wikiPageWikiLink Red_giant.
- Theta_Coronae_Borealis wikiPageWikiLink Star_catalogue.
- Theta_Coronae_Borealis wikiPageWikiLink Stellar_classification.
- Theta_Coronae_Borealis wikiPageWikiLinkText "Theta Coronae Borealis".
- Theta_Coronae_Borealis wikiPageWikiLinkText "Theta".
- Theta_Coronae_Borealis wikiPageWikiLinkText "θ Coronae Borealis".
- Theta_Coronae_Borealis wikiPageWikiLinkText "θ CrB".
- Theta_Coronae_Borealis appmagV "4.13".
- Theta_Coronae_Borealis constell Corona_Borealis.
- Theta_Coronae_Borealis epoch Epoch_(astronomy).
- Theta_Coronae_Borealis equinox "J2000.0".
- Theta_Coronae_Borealis pError "0.46".
- Theta_Coronae_Borealis parallax "8.69".
- Theta_Coronae_Borealis propMoDec "-9.39".
- Theta_Coronae_Borealis propMoRa "-20.15".
- Theta_Coronae_Borealis radialV "−25.7 ± 0.3".
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:DEC.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:RA.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Reflist.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_astrometry.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_begin.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_catalog.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_end.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_observe.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Starbox_reference.
- Theta_Coronae_Borealis wikiPageUsesTemplate Template:Stars_of_Corona_Borealis.
- Theta_Coronae_Borealis subject Category:Bayer_objects.
- Theta_Coronae_Borealis subject Category:Be_stars.
- Theta_Coronae_Borealis subject Category:Corona_Borealis_(constellation).
- Theta_Coronae_Borealis hypernym System.
- Theta_Coronae_Borealis type CelestialBody.
- Theta_Coronae_Borealis type Place.
- Theta_Coronae_Borealis type Star.
- Theta_Coronae_Borealis type Catalogue.
- Theta_Coronae_Borealis type Location.
- Theta_Coronae_Borealis type Place.
- Theta_Coronae_Borealis type Thing.
- Theta_Coronae_Borealis comment "Theta Coronae Borealis (θ CrB) is a binary star system in the constellation Corona Borealis. It shines with a combined apparent visual magnitude (V band) of 4.13. There are two components: Theta Coronae Borealis A is of apparent magnitude 4.16, while Theta Coronae Borealis B lies around 1 arcsecond distant and has an apparent magnitude of 6.29. The system is located around 375 light-years from Earth, as estimated from its parallax of 8.69 milliarcseconds.".
- Theta_Coronae_Borealis label "Theta Coronae Borealis".
- Theta_Coronae_Borealis sameAs Q937748.
- Theta_Coronae_Borealis sameAs Theta_Coronae_Borealis.
- Theta_Coronae_Borealis sameAs Theta_Coronae_Borealis.
- Theta_Coronae_Borealis sameAs Theta_Coronae_Borealis.
- Theta_Coronae_Borealis sameAs Theta_Coronae_Borealis.
- Theta_Coronae_Borealis sameAs Theta_Coronae_Borealis.
- Theta_Coronae_Borealis sameAs m.0m0p177.
- Theta_Coronae_Borealis sameAs Q937748.
- Theta_Coronae_Borealis wasDerivedFrom Theta_Coronae_Borealis?oldid=661636969.
- Theta_Coronae_Borealis isPrimaryTopicOf Theta_Coronae_Borealis.
- Theta_Coronae_Borealis name "θ Coronae Borealis".