Alpha Trianguli

light-years
Proper names: Alpha Trianguli, Caput Trianguli, Rasalmothallah, 2 Trianguli
Catalog numbers:
     Gliese (Gl) 78.1, Henry Draper (HD) 11443, Bonner Durchmusterung (BD) +28°312 , Hipparcos Input Catalog (HIC) 8796, Smithsonian Astrophysical Observatory (SAO) 74996, Fifth Fundamental Catalogue (FK5) 64, Hoffleit Bright Star (HR) 544, Woolley (Wo) 9062
Arity: singular
Right Ascension and Declination: 1h53m4.905s, +29°34'43.82" (epoch 2000.0)
Distance from Sol: 64.1 light-years (19.7 parsecs)
Standard error in distance: 1.5864%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 49.1, 26.4, 31.6
Galactic (X,Y,Z) coordinates in ly: -41.7, 35.9, -33.0
Proper motion: 0.231 arcsec/yr (177.0° from north)
Radial Velocity: -16.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 13.7, -21.3, -9.04

What do all these fields mean?


NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Spectral class: F6
Luminosity Class: IV
Apparent visual magnitude: +3.42
Absolute visual magnitude: +1.95
Visual luminosity: 14.5 x Sol
Color indices: B-V= +0.48
Diameter: 3.17 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 3.81 A.U.s
Angular size of star in sky in CZ: 0.444003 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 4-April-2001.