Bonner Durchmusterung -21°5081

light-years

Catalog numbers:
     Gliese (Gl) 722, Henry Draper (HD) 172051, Bonner Durchmusterung (BD) -21°5081, Hipparcos Input Catalog (HIC) 91438, Smithsonian Astrophysical Observatory (SAO) 187086, Hoffleit Bright Star (HR) 6998
Arity: singular
Right Ascension and Declination: 18h38m53.406s, -21°3'6.77" (epoch 2000.0)
Distance from Sol: 42.3 light-years (13.0 parsecs)
Standard error in distance: 1.0916%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 6.67, -39.0, -15.2
Galactic (X,Y,Z) coordinates in ly: 40.9, 9.51, -5.45
Proper motion: 0.171 arcsec/yr (206.0° from north)
Radial Velocity: 38.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 39.7, -1.59, -5.07

What do all these fields mean?


Spectral class: G5
Luminosity Class: V
Apparent visual magnitude: +5.86
Absolute visual magnitude: +5.29
Visual luminosity: 0.67 x Sol
Color indices: B-V= +0.68, U-B= +0.14, R-I= +0.24
Diameter: 0.93 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.82 A.U.s
Angular size of star in sky in CZ: 0.607447 degrees

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