Bonner Durchmusterung +2°4076

light-years

Catalog numbers:
     Gliese (Gl) 775, Henry Draper (HD) 190007, Bonner Durchmusterung (BD) +2°4076, Hipparcos Input Catalog (HIC) 98698, Smithsonian Astrophysical Observatory (SAO) 125379
Arity: singular
Right Ascension and Declination: 20h2m47.067s, +3°19'34.36" (epoch 2000.0)
Distance from Sol: 42.8 light-years (13.1 parsecs)
Standard error in distance: 1.3326%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 21.8, -36.7, 2.48
Galactic (X,Y,Z) coordinates in ly: 29.4, 29.1, -10.9
Proper motion: 0.15 arcsec/yr (326.6° from north)
Radial Velocity: -29.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -21.9, -15.7, 15.6

What do all these fields mean?


Spectral class: K4
Luminosity Class: V
Apparent visual magnitude: +7.46
Absolute visual magnitude: +6.87
Visual luminosity: 0.16 x Sol
Color indices: B-V= +1.14, U-B= +1.08, R-I= +0.42
Diameter: 0.79 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.39 A.U.s
Angular size of star in sky in CZ: 1.066994 degrees

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