Tau(3) Eridani

light-years
Proper names: Tau(3) Eridani, 11 Eridani, Tau Eridani
Catalog numbers:
     Gliese (Gl) 121, Henry Draper (HD) 18978, Cordoba Durchmusterung (CD) -24°1387 , Hipparcos Input Catalog (HIC) 14146, Smithsonian Astrophysical Observatory (SAO) 168249, Fifth Fundamental Catalogue (FK5) 1085, Hoffleit Bright Star (HR) 919
Arity: singular
Right Ascension and Declination: 3h2m23.507s, -23°37'27.99" (epoch 2000.0)
Distance from Sol: 86.2 light-years (26.4 parsecs)
Standard error in distance: 1.7903%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 55.2, 56.4, -34.5
Galactic (X,Y,Z) coordinates in ly: -36.2, -23.9, -74.4
Proper motion: 0.157 arcsec/yr (250.8° from north)
Radial Velocity: -9.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 19.2, 10.6, -1.40

What do all these fields mean?


Spectral class: A4
Luminosity Class: IV
Apparent visual magnitude: +4.08
Absolute visual magnitude: +1.97
Visual luminosity: 14.2 x Sol
Color indices: B-V= +0.16
Diameter: 1.79 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 3.77 A.U.s
Angular size of star in sky in CZ: 0.253183 degrees

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