Tau(1) Eridani

light-years
Proper names: Tau(1) Eridani, 1 Eridani, Tau Eridani
Catalog numbers:
     Gliese (Gl) 111, Henry Draper (HD) 17206, Bonner Durchmusterung (BD) -19°518 , Hipparcos Input Catalog (HIC) 12843, Smithsonian Astrophysical Observatory (SAO) 148584, Hoffleit Bright Star (HR) 818
Arity: singular
Right Ascension and Declination: 2h45m6.216s, -18°34'21.28" (epoch 2000.0)
Distance from Sol: 45.6 light-years (14.0 parsecs)
Standard error in distance: 1.0509%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 32.5, 28.5, -14.5
Galactic (X,Y,Z) coordinates in ly: -20.0, -7.65, -40.2
Proper motion: 0.334 arcsec/yr (83.5° from north)
Radial Velocity: 25.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -26.3, -17.1, -12.6

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: V
Apparent visual magnitude: +4.47
Absolute visual magnitude: +3.74
Visual luminosity: 2.78 x Sol
Color indices: B-V= +0.48
Diameter: 1.28 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.67 A.U.s
Angular size of star in sky in CZ: 0.408067 degrees

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