Bonner Durchmusterung -18°4986

light-years

Catalog numbers:
     Gliese (Gl) 716, Henry Draper (HD) 170657, Bonner Durchmusterung (BD) -18°4986, Hipparcos Input Catalog (HIC) 90790, Smithsonian Astrophysical Observatory (SAO) 161557, New Suspected Variable (NSV) 10944
Arity: singular
Right Ascension and Declination: 18h31m18.999s, -18°54'32.11" (epoch 2000.0)
Distance from Sol: 43.1 light-years (13.2 parsecs)
Standard error in distance: 1.1619%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 5.55, -40.4, -14.0
Galactic (X,Y,Z) coordinates in ly: 41.6, 10.5, -3.63
Proper motion: 0.239 arcsec/yr (215.2° from north)
Radial Velocity: -41.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -36.4, -24.5, 5.55

What do all these fields mean?


Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +6.81
Absolute visual magnitude: +6.21
Visual luminosity: 0.29 x Sol
Color indices: B-V= +0.85, U-B= +0.56, R-I= +0.30
Diameter: 0.83 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.54 A.U.s
Angular size of star in sky in CZ: 0.826156 degrees

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