Groombridge 1618


Catalog numbers:
     Gliese (Gl) 380, Henry Draper (HD) 88230, Bonner Durchmusterung (BD) +501725, Giclas (G) 196-9, Luyten Half-Second (LHS) 280, Hipparcos Input Catalog (HIC) 49908, Smithsonian Astrophysical Observatory (SAO) 43223, Groombridge (GRB) 1618, New Suspected Variable (NSV) 4765
Heavy element abundance: 191% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 10h11m22.25s, +49°27'14.7" (epoch 2000.0)
Distance from Sol: 15.89 light-years (4.873 parsecs)
Standard error in distance: 0.3931%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -9.193, 4.716, 12.08
Galactic (X,Y,Z) coordinates in ly: -9.337, 2.338, 12.64
Proper motion: 1.454 arcsec/yr (248.9° from north)
Radial Velocity: -25.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -9.681, -21.02, -35.18

What do all these fields mean?

Spectral class: K7n
Luminosity Class: V
Apparent visual magnitude: +6.60
Absolute visual magnitude: +8.16
Visual luminosity: 0.0473 x Sol
Color indices: B-V= +1.36, U-B= +1.28, R-I= +0.60
Mass: 0.67 x Sol
Source for mass: European Southern Observatory
Diameter: 0.605 x Sol
Source for diameter: European Southern Observatory
Comfort Zone (visual): 0.218 A.U.s
Orbital period in CZ: 45.2767 days
Tidal index in CZ: 65.0774
Angular size of star in sky in CZ: 1.482305 degrees

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