Bonner Durchmusterung -8°5818

Catalog numbers:
Gliese (Gl) 848.4, Henry Draper (HD) 210277, Bonner Durchmusterung (BD) -8°5818, Hipparcos Input Catalog (HIC) 109378, Smithsonian Astrophysical Observatory (SAO) 145906, Woolley (Wo) 9769
Arity: singular
Right Ascension and Declination: 22h9m29.876s, -7°32'55.25" (epoch 2000.0)
Distance from Sol: 69.4 light-years (21.3 parsecs)
Standard error in distance: 1.6541%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 61.0, -31.9, -9.12
Galactic (X,Y,Z) coordinates in ly: 28.2, 37.6, -51.1
Proper motion: 0.455 arcsec/yr (169.5° from north)
Radial Velocity: -21.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 4.18, -50.2, -5.57

What do all these fields mean?

Spectral class: G8
Luminosity Class: IV
Apparent visual magnitude: +6.55
Absolute visual magnitude: +4.91
Visual luminosity: 0.95 x Sol
Color indices: B-V= +0.75, U-B= +0.36, R-I= +0.25
Diameter: 0.96 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.97 A.U.s
Angular size of star in sky in CZ: 0.526393 degrees
Detected companions: 1
Companion b:
     Mass: 2.4 x Jupiter
     Standard error in mass: 16.667%
     Source for mass: Trilling et al. (1999, 2000)
     Period: 1.20 years
     Standard Error in period: 5.72082%
     Semimajor Axis: 1.097 A.U.s
     Eccentricity: 0.45
     Periastron distance: 0.60335 A.U.s
     Apastron distance: 1.59065 A.U.s
     Source for orbit data: Marcy & Butler

Data for this star system were most recently updated on 4-April-2001.