Bonner Durchmusterung +31°4574

light-years

Catalog numbers:
     Gliese (Gl) 840, Henry Draper (HD) 208313, Bonner Durchmusterung (BD) +31°4574, Hipparcos Input Catalog (HIC) 108156, Smithsonian Astrophysical Observatory (SAO) 71824
Arity: singular
Right Ascension and Declination: 21h54m45.09s, +32°19'43.15" (epoch 2000.0)
Distance from Sol: 66.3 light-years (20.3 parsecs)
Standard error in distance: 1.8548%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 47.8, -29.1, 35.4
Galactic (X,Y,Z) coordinates in ly: 5.05, 63.1, -19.7
Proper motion: 0.31 arcsec/yr (136.2° from north)
Radial Velocity: -13.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -3.81, -21.8, -24.3

What do all these fields mean?


Spectral class: K0e
Luminosity Class: V
Apparent visual magnitude: +7.77
Absolute visual magnitude: +6.23
Visual luminosity: 0.28 x Sol
Color indices: B-V= +0.92, U-B= +0.64
Diameter: 0.85 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.53 A.U.s
Angular size of star in sky in CZ: 0.856058 degrees

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