Bonner Durchmusterung +332777

light-years

Catalog numbers:
     Gliese (Gl) 638, Henry Draper (HD) 151288, Bonner Durchmusterung (BD) +332777, Giclas (G) 181-6, Hipparcos Input Catalog (HIC) 82003, Smithsonian Astrophysical Observatory (SAO) 65525, New Suspected Variable (NSV) 7951
Arity: singular
Right Ascension and Declination: 16h45m6.308s, +33°30'33.54" (epoch 2000.0)
Distance from Sol: 31.87 light-years (9.770 parsecs)
Standard error in distance: 0.8525%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -8.529, -25.16, 17.59
Galactic (X,Y,Z) coordinates in ly: 14.03, 20.23, 20.24
Proper motion: 0.389 arcsec/yr (352.6° from north)
Radial Velocity: -30.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -29.54, -12.40, -15.32

What do all these fields mean?


Spectral class: K7
Luminosity Class: V
Apparent visual magnitude: +8.10
Absolute visual magnitude: +8.15
Visual luminosity: 0.0477 x Sol
Color indices: B-V= +1.37, U-B= +1.29, R-I= +0.57
Diameter: 0.809 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.219 A.U.s
Angular size of star in sky in CZ: 1.972633 degrees

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