Bonner Durchmusterung +4°3589

light-years

Catalog numbers:
     Gliese (Gl) 702.2, Henry Draper (HD) 165401, Bonner Durchmusterung (BD) +4°3589, Hipparcos Input Catalog (HIC) 88622, Smithsonian Astrophysical Observatory (SAO) 123112, AGK3 Reference (AGK3R) 16127, Woolley (Wo) 9614
Age: 1300 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Heavy element abundance: 28% of Sol
Source for heavy element abundance: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Arity: singular
Points of interest:
     B. Edvardsson et al. give a venerable age of over 15 thousand-million years for this star, which is questionable since G2 stars are only supposed to remain on the main sequence for about 12 thousand-million years.

Right Ascension and Declination: 18h5m37.496s, +4°39'25.7" (epoch 2000.0)
Distance from Sol: 79.6 light-years (24.4 parsecs)
Standard error in distance: 2.1012%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 1.95, -79.3, 6.46
Galactic (X,Y,Z) coordinates in ly: 65.9, 41.5, 16.2
Proper motion: 0.314 arcsec/yr (182.5° from north)
Radial Velocity: -120.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -79.6, -89.1, -39.3

What do all these fields mean?


Spectral class: G2
Luminosity Class: V
Apparent visual magnitude: +6.80
Absolute visual magnitude: +4.86
Visual luminosity: 0.99 x Sol
Color indices: B-V= +0.62, U-B= +0.04, R-I= +0.22
Diameter: 0.95 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.99 A.U.s
Angular size of star in sky in CZ: 0.509712 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 12-May-2001.