Bonner Durchmusterung +52°857

light-years

Catalog numbers:
     Gliese (Gl) 172, Henry Draper Extension (HDE) 232979, Bonner Durchmusterung (BD) +52°857, Giclas (G) 175-42, Luyten Half-Second (LHS) 1688, Hipparcos Input Catalog (HIC) 21553, Smithsonian Astrophysical Observatory (SAO) 24722, Vyssotsky McCormick (McC) 449
Arity: possible spectroscopic binary
Right Ascension and Declination: 4h37m40.979s, +52°53'38.01" (epoch 2000.0)
Distance from Sol: 33.2 light-years (10.2 parsecs)
Standard error in distance: 1.2082%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 7.05, 18.8, 26.5
Galactic (X,Y,Z) coordinates in ly: -29.7, 14.8, 2.55
Proper motion: 0.556 arcsec/yr (145.2° from north)
Radial Velocity: 32.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -41.5, -9.17, -0.63

What do all these fields mean?


Spectral class: K8e
Luminosity Class: V
Apparent visual magnitude: +8.62
Absolute visual magnitude: +8.58
Visual luminosity: 0.032 x Sol
Color indices: B-V= +1.40, U-B= +1.14, R-I= +0.65
Diameter: 0.67 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.18 A.U.s
Angular size of star in sky in CZ: 1.992905 degrees

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