Bonner Durchmusterung +71°851

light-years

Catalog numbers:
     Gliese (Gl) 690, Bonner Durchmusterung (BD) +71°851, Giclas (G) 240-65, Hipparcos Input Catalog (HIC) 86340, Smithsonian Astrophysical Observatory (SAO) 8866, Vyssotsky McCormick (McC) 172
Arity: singular
Right Ascension and Declination: 17h38m34.15s, +71°19'56.6" (epoch 2000.0)
Distance from Sol: 78.0 light-years (23.9 parsecs)
Standard error in distance: 1.9001%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -2.33, -24.9, 73.9
Galactic (X,Y,Z) coordinates in ly: -13.9, 65.1, 40.7
Proper motion: 0.338 arcsec/yr (341.0° from north)
Radial Velocity: -0.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -35.7, -12.5, 6.26

What do all these fields mean?


Spectral class: M0
Luminosity Class: V
Apparent visual magnitude: +9.17
Absolute visual magnitude: +7.28
Visual luminosity: 0.11 x Sol
Color indices: B-V= +1.10, U-B= +1.01, R-I= +0.44
Diameter: 0.69 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.33 A.U.s
Angular size of star in sky in CZ: 1.124798 degrees

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