Bonner Durchmusterung +40°2903

light-years

Catalog numbers:
     Gliese (Gl) 591, Henry Draper (HD) 139323, Bonner Durchmusterung (BD) +40°2903, Giclas (G) 179-37, Hipparcos Input Catalog (HIC) 76375, Smithsonian Astrophysical Observatory (SAO) 64799, Aitken Double Star (ADS) 9716C, New Suspected Variable (NSV) 7156
Arity: singular
Right Ascension and Declination: 15h35m56.59s, +39°49'52" (epoch 2000.0)
Distance from Sol: 72.6 light-years (22.3 parsecs)
Standard error in distance: 1.5988%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -32.8, -45.1, 46.5
Galactic (X,Y,Z) coordinates in ly: 19.1, 38.8, 58.3
Proper motion: 0.458 arcsec/yr (276.9° from north)
Radial Velocity: -65.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -44.2, -63.8, -24.8

What do all these fields mean?


Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +7.65
Absolute visual magnitude: +5.91
Visual luminosity: 0.38 x Sol
Color indices: B-V= +0.96, U-B= +0.76, R-I= +0.29
Diameter: 0.83 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.61 A.U.s
Angular size of star in sky in CZ: 0.721843 degrees

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