Kapteyn's Star

light-years
Proper names: Kapteyn's Star
Catalog numbers:
     Gliese (Gl) 191, Henry Draper (HD) 33793, Cordoba Durchmusterung (CD) -451841, Luyten Half-Second (LHS) 29, Hipparcos Input Catalog (HIC) 24186, Smithsonian Astrophysical Observatory (SAO) 217223, UGPMF 628
Heavy element abundance: 32% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 5h11m40.6s, -45°1'7.5" (epoch 2000.0)
Distance from Sol: 12.78 light-years (3.918 parsecs)
Standard error in distance: 0.3358%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 1.890, 8.832, -9.038
Galactic (X,Y,Z) coordinates in ly: -3.465, -9.776, -7.463
Proper motion: 8.706 arcsec/yr (131.1° from north)
Radial Velocity: 245.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 20.72, -288.6, -51.91

What do all these fields mean?


Spectral class: M0
Luminosity Class: V
Apparent visual magnitude: +8.86
Absolute visual magnitude: +10.89
Visual luminosity: 0.00383 x Sol
Color indices: B-V= +1.55, U-B= +1.21, R-I= +0.79
Mass: 0.281 x Sol
Source for mass: European Southern Observatory
Diameter: 0.291 x Sol
Source for diameter: European Southern Observatory
Comfort Zone (visual): 0.0619 A.U.s
Orbital period in CZ: 10.6066 days
Tidal index in CZ: 1185.85
Angular size of star in sky in CZ: 2.510085 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 26-April-2003.