Eggen/Greenstein white dwarf 69

light-years

Catalog numbers:
     Eggen/Greenstein white dwarf (EG) 69, Luyten Two-Tenth (LTT) 12661
Arity: singular
Right Ascension and Declination: 9h55m0s, +24°47'30" (epoch 1950.0)
Distance from Sol: 79.2 light-years (24.3 parsecs)
Standard error in distance: 9.8468%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -61.4, 37.3, 33.2
Galactic (X,Y,Z) coordinates in ly: -44.5, -22.4, 61.6
Proper motion: 0.391 arcsec/yr (220.0° from north)
Radial Velocity: 124 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -82.8, -71.5, 73.7

What do all these fields mean?


Spectral class: DA6
Luminosity Class: wd
Apparent visual magnitude: +15.09
Absolute visual magnitude: +13.16
Visual luminosity: 0.00047 x Sol
Color indices: B-V= +0.25, U-B= -0.54
Diameter: 0.0105 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.022 A.U.s
Angular size of star in sky in CZ: 0.257624 degrees

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