Bonner Durchmusterung +45°3371

light-years

Catalog numbers:
     Gliese (Gl) 816.1, Henry Draper (HD) 200560, Bonner Durchmusterung (BD) +45°3371, Giclas (G) 212-17, Hipparcos Input Catalog (HIC) 103859, Smithsonian Astrophysical Observatory (SAO) 50388, Aitken Double Star (ADS) 14585, S.W. Burnham (BU) 1138C, Woolley (Wo) 9717
Arity: binary
Right Ascension and Declination: 21h2m40.759s, +45°53'5.55" (epoch 2000.0)
Distance from Sol: 63.1 light-years (19.4 parsecs)
Standard error in distance: 1.3748%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 31.4, -30.7, 45.3
Galactic (X,Y,Z) coordinates in ly: 2.77, 63.1, -0.63
Proper motion: 0.422 arcsec/yr (69.5° from north)
Radial Velocity: -13.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -35.0, -12.3, -17.6

What do all these fields mean?


Component A:
Spectral class: K2.5
Luminosity Class: V
Apparent visual magnitude: +7.68
Absolute visual magnitude: +6.25
Visual luminosity: 0.28 x Sol
Color indices: B-V= +0.97, U-B= +0.78
Diameter: 0.84 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.53 A.U.s
Angular size of star in sky in CZ: 0.851492 degrees


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +13.00
Absolute visual magnitude: +11.57
Visual luminosity: 0.0021 x Sol
Diameter: 0.36 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.045 A.U.s
Angular size of star in sky in CZ: 4.229181 degrees

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