Alpha Trianguli

α TriMetallahα TrianguliMothallahα Tri (Mothallah)
Alpha Trianguli (α Trianguli, abbreviated Alpha Tri, α Tri) is a spectroscopic binary star in the constellation of Triangulum.wikipedia
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Triangulum

Triangulum (constellation)TriTriangula
Alpha Trianguli (α Trianguli, abbreviated Alpha Tri, α Tri) is a spectroscopic binary star in the constellation of Triangulum. In Babylonian astronomy, Alpha Trianguli is listed as UR.BAR.RA "The Wolf", bearing the epithet "the seeder of the plough" in the MUL.APIN, listed after "The Plough", the name for a constellation formed of Triangulum plus Gamma Andromedae.
The white stars Beta and Gamma Trianguli, of apparent magnitudes 3.00 and 4.00, respectively, form the base of the triangle and the yellow-white Alpha Trianguli, of magnitude 3.41, the apex.

Beta Trianguli

β Trianguliβ TriBeta
In combination with Beta Trianguli, these stars were called Al Mīzān, which is Arabic for "The Scale Beam". It forms the second brightest star or star system in this generally faint constellation, following Beta Trianguli.

List of stars in Triangulum

second brightest starTriangulum
It forms the second brightest star or star system in this generally faint constellation, following Beta Trianguli.

Constellation

constellationsEuropean constellationModern constellation
Alpha Trianguli (α Trianguli, abbreviated Alpha Tri, α Tri) is a spectroscopic binary star in the constellation of Triangulum.

Stellar parallax

parallax shiftparallaxparallax measurements
Based on parallax measurements obtained during the Hipparcos mission, it is approximately 63.3 ly distant from the Sun.

Hipparcos

HIPHipparcos CatalogueHipparcos satellite
Based on parallax measurements obtained during the Hipparcos mission, it is approximately 63.3 ly distant from the Sun.

Sun

solarSolThe Sun
Based on parallax measurements obtained during the Hipparcos mission, it is approximately 63.3 ly distant from the Sun.

Latinisation of names

LatinizedLatinisedlatinisation
α Trianguli (Latinised to Alpha Trianguli) is the system's Bayer designation.

Bayer designation

BayerdesignationBayer letter
α Trianguli (Latinised to Alpha Trianguli) is the system's Bayer designation.

Arabic

Arabic languageArabic-languageArab
The system bore the traditional names Ras al Muthallah or Mothallah and Caput Trianguli derived from the Arabic رأس المثلث' raʼs al-muthallath "the head of the triangle" and its Latin translation.

Latin

Latin languageLat.la
The system bore the traditional names Ras al Muthallah or Mothallah and Caput Trianguli derived from the Arabic رأس المثلث' raʼs al-muthallath "the head of the triangle" and its Latin translation.

International Astronomical Union

IAUWorking Group for Planetary System NomenclatureInternational Astronomical Union (IAU)
The International Astronomical Union Working Group on Star Names (WGSN) has approved the name Mothallah for this star.

IAU Working Group on Star Names

Working Group on Star NamesIAU-approved
The International Astronomical Union Working Group on Star Names (WGSN) has approved the name Mothallah for this star.

Star system

multiple star systemtriple starmultiple systems
For members of multiple star systems, and where a component letter (e.g. from the Washington Double Star Catalog) is not explicitly shown in the namelist, the WGSN says that the name should be understood to be attributed to the visually brightest component by visual brightness.

Washington Double Star Catalog

WDSWashington Double Star CatalogueWDS catalog
For members of multiple star systems, and where a component letter (e.g. from the Washington Double Star Catalog) is not explicitly shown in the namelist, the WGSN says that the name should be understood to be attributed to the visually brightest component by visual brightness.

Babylonian astronomy

Babylonian astronomersBabylonianastronomer
In Babylonian astronomy, Alpha Trianguli is listed as UR.BAR.RA "The Wolf", bearing the epithet "the seeder of the plough" in the MUL.APIN, listed after "The Plough", the name for a constellation formed of Triangulum plus Gamma Andromedae.

MUL.APIN

In Babylonian astronomy, Alpha Trianguli is listed as UR.BAR.RA "The Wolf", bearing the epithet "the seeder of the plough" in the MUL.APIN, listed after "The Plough", the name for a constellation formed of Triangulum plus Gamma Andromedae.

Gamma Andromedae

γ AndromedaeAlmachγ And
In Babylonian astronomy, Alpha Trianguli is listed as UR.BAR.RA "The Wolf", bearing the epithet "the seeder of the plough" in the MUL.APIN, listed after "The Plough", the name for a constellation formed of Triangulum plus Gamma Andromedae.

Stellar classification

spectral typeK-typeG-type
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.

Subgiant

subgiant staryellow subgiantsubgiant branch
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.

Giant star

giantorange giantgiants
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.

Binary star

spectroscopic binaryeclipsing binarybinary
Alpha Trianguli (α Trianguli, abbreviated Alpha Tri, α Tri) is a spectroscopic binary star in the constellation of Triangulum.

Spheroid

oblate spheroidoblateprolate spheroid
Because the primary star is rotating rapidly, it has assumed the shape of an oblate spheroid.

Ellipsoid

ellipsoidalellipsoidstriaxial
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.

Rotating ellipsoidal variable

ellipsoidal variableellipsoidal variationrotating ellipsoidal
Such stars are termed ellipsoidal variables.