Alpha Trianguli

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Star
α trianguli
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation triangle
Right ascension 01 h 53 m 4.91 s
declination + 29 ° 34 ′ 43.8 ″
Apparent brightness 3.42 likes
Typing
B − V color index +0.49 
U − B color index +0.06 
R − I index +0.28 
Spectral class F6 IV
Astrometry
Radial velocity (−12.1 ± 3.1) km / s
parallax (51.50 ± 0.23)  mas
distance (63.3 ± 0.3)  ly
(19.42 ± 0.09)  pc  
Visual absolute brightness M vis +2.0 mag
Proper movement 
Rec. Share: (+10.82 ± 0.21)  mas / a
Dec. portion: (−234.24 ± 0.16)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name α trianguli
Flamsteed name 2 triangules
Bonn survey BD + 28 ° 312
Bright Star Catalog HR 544 [1]
Henry Draper Catalog HD 11443 [2]
Hipparcos catalog HIP 8796 [3]
SAO catalog SAO 74996 [4]
Tycho catalog TYC 1763-3028-1 [5]
annotation
  1. ↑ estimated from apparent brightness and distance

α Trianguli ( Alpha Trianguli , α Tri ) is a star of the spectral class F6 with an apparent magnitude of 3.4 mag in the constellation Triangulum . It is 63 light years from Earth.

The star bears the historical proper names Metallah , Elmuthalleth or Mothallah (from Arabic رأس المثلث, DMG raʾs al-muṯallaṯ  'tip of the triangle') and Caput Trianguli (Latin for "head of the triangle").

The IAU has the historical proper names on August 21, 2016 Mothallah defined as standardized proper name for this star.

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ Bulletin of the IAU Working Group on Star Names, No. October 2, 2016. (PDF) Retrieved November 10, 2016 (English, 151 KiB).