Alpha Trianguli


Alpha Trianguli
α Trianguli
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension 01h 53m 04.9s
Declination +29° 34' 44"
Apparent magnitude (V) +3.41
Distance 64.1 ± 1.0 ly
(19.7 ± 0.3 pc)
Spectral type F6IV
Other designations
Mothallah, Metallah, Ras al Muthallah,
Elmuthalleth, Caput Trianguli, 2 Trianguli, HR 544, HD 11443, BD+28 312, FK5 64, HIP 8796, SAO 74996, GC 2272, CCDM 01531+2935

Alpha Trianguli (α Tri, α Trianguli) is a binary star in the constellation Triangulum. It has the traditional names Mothallah or Ras al Muthallah (alternate spellings Mathallah, Metallah, Ras al Mothallah, Elmuthalleth), and Caput Trianguli, from the Arabic رأس المثلث ra’s al-muθallaθ "the head of the triangle" and its Latin translation.

Alpha Trianguli is a yellow-white F-type subgiant with a mean apparent magnitude of +3.41. Its mass is about 1.5 times that of the Sun and its diameter is about 3 times as large as the Sun's.

Mothallah is a spectroscopic binary whose components have an orbital period of only 1.74 days. The companion star is a mere 6 million km (3.7 million miles) from the main star. The whole system is approximately 64.1 light years from Earth.

α Tri 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[1].

References

  1. ^ Rogers, J. H. (February 1998). "Origins of the ancient constellations: I. The Mesopotamian traditions". Journal of the British Astronomical Association, no.1 108: 9–28. Bibcode 1998JBAA..108....9R. 

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Alpha Trianguli — α Trianguli Données d observation (Époque ) Ascension droite 01h 53m 04.9s Déclinaison +29° 34′ 44″ Constellation Triangle Magnitude apparente +3,42 …   Wikipédia en Français

  • Alpha Trianguli — Stern Metallah (α Tri) Beobachtungsdaten Epoche: J2000.0 Sternbild Triangulum Rektaszension 1h 53m 04s Deklination +29° 34 43 Scheinbare Helligkeit …   Deutsch Wikipedia

  • Alpha Trianguli Australis — (α TrA / α Trianguli Australis) Données d observation (Époque J2000.0) Ascension droite 16h 48m 39,9s Déclinaison 69° 01′ 40″ Constellation Triangle austral …   Wikipédia en Français

  • Alpha Trianguli Australis — Starbox begin name=Alpha Trianguli Australis Starbox observe epoch=J2000 ra=16h 48m 39.9s dec= 69° 01 prime; 40 Prime; appmag v=1.91 constell=Triangulum Australe Starbox character class=K2 IIb IIIa b v=1.45 u b=0.32 variable=? Starbox astrometry… …   Wikipedia

  • Alpha Trianguli Australis — Atria ist der Eigenname des Sterns α Trianguli Australis. Der Name ist ein Kunstwort aus der Benennung des Sterns Alpha Trianguli Australis). Atria gehört der Spektralklasse K2 an und besitzt eine Helligkeit von +1,9 mag. Atria ist ca. 415… …   Deutsch Wikipedia

  • Alpha Tri — Alpha Trianguli α Trianguli Données d observation (Époque ) Ascension droite 01h 53m 04.9s Déclinaison +29° 34′ 44″ Constellation Triangle Magnitude apparente +3,42 …   Wikipédia en Français

  • Alpha TrA — Alpha Trianguli Australis Alpha Trianguli Australis (α TrA / α Trianguli Australis) Données d observation (Époque J2000.0) Ascension droite 16h 48m 39,9s Déclinaison 69° 01′ 40″ Constellation Triangle austral …   Wikipédia en Français

  • Alpha Triangulum Australis — Atria ist der Eigenname des Sterns α Trianguli Australis. Der Name ist ein Kunstwort aus der Benennung des Sterns Alpha Trianguli Australis). Atria gehört der Spektralklasse K2 an und besitzt eine Helligkeit von +1,9 mag. Atria ist ca. 415… …   Deutsch Wikipedia

  • Alpha Arietis — α Arietis α Arietis shown in its constellation, Aries. Observation data Epoch J2000.0      Equinox J2000.0 ( …   Wikipedia

  • Alpha Comae Berenices — This article is about the star called Diadem; for alternate meanings, see Diadem. α Comae Berenices Coma Berenices constellation …   Wikipedia