Eggen/Greenstein white dwarf 131

light-years

Catalog numbers:
     Gliese (Gl) 754.1, Hipparcos Input Catalog (HIC) 95071, Luyten Double Star (LDS) 678, Luyten Two-Tenth (LTT) 7658
Arity: binary
Right Ascension and Declination: 19h20m34.95s, -7°40'2.5" (epoch 2000.0)
Distance from Sol: 33.0 light-years (10.1 parsecs)
Standard error in distance: 3.0422%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: 11.3, -30.7, -4.40
Galactic (X,Y,Z) coordinates in ly: 28.2, 16.1, -6.02
Proper motion: 0.199 arcsec/yr (198.0° from north)
Source for proper motion: Gliese

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +11.42
Combined visual luminosity: 0.0024 x Sol
Observed Separation: 354 A.U.s
As seen from A:
     B would appear as magnitude -6.73
As seen from B:
     A would appear as magnitude -6.57


Component A:
Catalog numbers:
     Catalogue Astrographique (AC) -7°342-402, Eggen/Greenstein white dwarf (EG) 131, Luyten (L) 923-21, McCook & Sion White Dwarf (WD) 1917-7
Spectral class: DQ5
Luminosity Class: wd
Apparent visual magnitude: +12.28
Absolute visual magnitude: +12.25
Visual luminosity: 0.0011 x Sol
Color indices: B-V= +0.06, U-B= -0.83, R-I= +0.04
Diameter: 0.0127 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.033 A.U.s
Angular size of star in sky in CZ: 0.204857 degrees


Component B:
Catalog numbers:
     Catalogue Astrographique (AC) -7°342-397, Luyten (L) 923-22
Right Ascension and Declination: 19h17m51s, -7°45'18" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 10.9, -30.8, -4.45
Galactic (X,Y,Z) coordinates in ly: 28.3, 15.9, -5.70
Proper motion: 0.199 arcsec/yr (198.0° from north)
Radial Velocity: 10 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 13.0, -3.52, -3.13
Spectral class: M5
Luminosity Class: V
Apparent visual magnitude: +12.12
Absolute visual magnitude: +12.09
Visual luminosity: 0.0013 x Sol
Color indices: B-V= +1.63, U-B= +1.42, R-I= +1.09
Comfort Zone (visual): 0.036 A.U.s

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