Tau(1) Gruis

light-years
Proper names: Tau(1) Gruis, Tau Gruis
Catalog numbers:
     Woolley (Wo) 9802, Henry Draper (HD) 216435, Cordoba Durchmusterung (CD) -49°13988, Hipparcos Input Catalog (HIC) 113044, Smithsonian Astrophysical Observatory (SAO) 231343, Hoffleit Bright Star (HR) 8700, Luyten Two-Tenth (LTT) 9249
Arity: singular
Right Ascension and Declination: 22h53m37.994s, -48°35'54.04" (epoch 2000.0)
Distance from Sol: 109 light-years (33.3 parsecs)
Standard error in distance: 2.3724%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 68.8, -20.5, -81.4
Galactic (X,Y,Z) coordinates in ly: 52.6, -17.5, -93.3
Proper motion: 0.236 arcsec/yr (110.0° from north)
Radial Velocity: -1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -28.1, -22.0, -10.6

What do all these fields mean?


Spectral class: G3
Luminosity Class: IV
Apparent visual magnitude: +6.03
Absolute visual magnitude: +3.42
Visual luminosity: 3.75 x Sol
Color indices: B-V= +0.62, U-B= +0.19
Diameter: 2.22 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.94 A.U.s
Angular size of star in sky in CZ: 0.610802 degrees

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