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- Alpha_Trianguli abstract "Alpha Trianguli (Alpha Tri, α Trianguli, α Tri) is the Bayer designation for a binary star in the constellation Triangulum. It has the traditional names Ras al Muthallah (or Mothallah) and Caput Trianguli.Estimates of the combined stellar classification for this system range from F5III to F6IV, with the luminosity class of 'IV' or 'III' indicating the primary component is a subgiant or giant star, respectively. It is a member of a close binary system—a spectroscopic binary—whose components complete an orbit about their center of mass once every 1.736 days. Because the primary star is rotating rapidly, it has assumed the shape of an oblate spheroid. The ellipsoidal profile of the star, as viewed from Earth, varies over the course of an orbit causing the luminosity to vary in magnitude during the same period. Such stars are termed ellipsoidal variables. Within a few million years, as the primary continues to evolve into a red giant star, the system may become a semi-detached binary with the Roche lobe becoming filled to overflowing.The mean apparent magnitude of +3.42 for this pair is bright enough to be readily seen with the naked eye. It forms the second brightest star or star system in this generally faint constellation, following Beta Trianguli. Parallax measurements place this system at a distance of 63.3 light-years (19.4 parsecs) from the Earth. The effective temperature of the primary's outer envelope is 6,288 K, giving it a yellow-white hue typical of F-type stars. It has a mean radius about three times the radius of the Sun. The system is an estimated 1.6 billion years old.".
- Alpha_Trianguli thumbnail Triangulum_IAU.svg?width=300.
- Alpha_Trianguli wikiPageExternalLink mothallah.html.
- Alpha_Trianguli wikiPageID "2695828".
- Alpha_Trianguli wikiPageRevisionID "602156474".
- Alpha_Trianguli absmagV "1.98".
- Alpha_Trianguli ageGyr "1.6".
- Alpha_Trianguli appmagV "+3.42".
- Alpha_Trianguli bV "+0.48".
- Alpha_Trianguli class "F5III to F6IV + M".
- Alpha_Trianguli component "α Tri A".
- Alpha_Trianguli component "α Tri B".
- Alpha_Trianguli constell Triangulum.
- Alpha_Trianguli epoch Epoch_(astronomy).
- Alpha_Trianguli gravity "3.91".
- Alpha_Trianguli hasPhotoCollection Alpha_Trianguli.
- Alpha_Trianguli mass "0.11".
- Alpha_Trianguli mass "1.7".
- Alpha_Trianguli metalFe "–0.09 to 0.00".
- Alpha_Trianguli pError "0.23".
- Alpha_Trianguli parallax "51.5".
- Alpha_Trianguli propMoDec "–234.24".
- Alpha_Trianguli propMoRa "10.82".
- Alpha_Trianguli radialV "–12.6".
- Alpha_Trianguli radius "3.22".
- Alpha_Trianguli rotationalVelocity "81.6".
- Alpha_Trianguli temperature "6288".
- Alpha_Trianguli uB "+0.06".
- Alpha_Trianguli variable Rotating_ellipsoidal_variable.
- Alpha_Trianguli subject Category:Bayer_objects.
- Alpha_Trianguli subject Category:F-type_subgiants.
- Alpha_Trianguli subject Category:Spectroscopic_binaries.
- Alpha_Trianguli subject Category:Stars_with_proper_names.
- Alpha_Trianguli subject Category:Triangulum_(constellation).
- Alpha_Trianguli type BayerObjects.
- Alpha_Trianguli type BinaryStar109221070.
- Alpha_Trianguli type CelestialBody109239740.
- Alpha_Trianguli type NaturalObject100019128.
- Alpha_Trianguli type Object100002684.
- Alpha_Trianguli type PhysicalEntity100001930.
- Alpha_Trianguli type SpectroscopicBinaries.
- Alpha_Trianguli type Star109444100.
- Alpha_Trianguli type StarsWithProperNames.
- Alpha_Trianguli type Whole100003553.
- Alpha_Trianguli type CelestialBody.
- Alpha_Trianguli type Star.
- Alpha_Trianguli type PhysicalBody.
- Alpha_Trianguli comment "Alpha Trianguli (Alpha Tri, α Trianguli, α Tri) is the Bayer designation for a binary star in the constellation Triangulum. It has the traditional names Ras al Muthallah (or Mothallah) and Caput Trianguli.Estimates of the combined stellar classification for this system range from F5III to F6IV, with the luminosity class of 'IV' or 'III' indicating the primary component is a subgiant or giant star, respectively.".
- Alpha_Trianguli label "Alfa Trianguli".
- Alpha_Trianguli label "Alpha Trianguli".
- Alpha_Trianguli label "Alpha Trianguli".
- Alpha_Trianguli label "Alpha Trianguli".
- Alpha_Trianguli label "Alpha Trianguli".
- Alpha_Trianguli label "Metallah".
- Alpha_Trianguli label "Metallah".
- Alpha_Trianguli label "Альфа Треугольника".
- Alpha_Trianguli label "婁宿增六".
- Alpha_Trianguli sameAs Alpha_Trianguli.
- Alpha_Trianguli sameAs Metallah.
- Alpha_Trianguli sameAs Alpha_Trianguli.
- Alpha_Trianguli sameAs Alfa_Trianguli.
- Alpha_Trianguli sameAs さんかく座アルファ星.
- Alpha_Trianguli sameAs Metallah.
- Alpha_Trianguli sameAs Alpha_Trianguli.
- Alpha_Trianguli sameAs m.07yhq0.
- Alpha_Trianguli sameAs Q1302050.
- Alpha_Trianguli sameAs Q1302050.
- Alpha_Trianguli sameAs Alpha_Trianguli.
- Alpha_Trianguli wasDerivedFrom Alpha_Trianguli?oldid=602156474.
- Alpha_Trianguli depiction Triangulum_IAU.svg.
- Alpha_Trianguli isPrimaryTopicOf Alpha_Trianguli.
- Alpha_Trianguli name "Alpha Trianguli".