Luyten Double Star 230

light-years

Catalog numbers:
     Gliese (Gl) 319.1, Henry Draper (HD) 74385, Cape Photographic Durchmusterung (CPD) -42°2834, Hipparcos Input Catalog (HIC) 42697, Smithsonian Astrophysical Observatory (SAO) 220304, UGPMF 188, Luyten Double Star (LDS) 230, Woolley (Wo) 9275
Arity: binary
Right Ascension and Declination: 8h42m7.26s, -42°55'46.9" (epoch 2000.0)
Distance from Sol: 72.9 light-years (22.4 parsecs)
Standard error in distance: 1.7355%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -34.7, 40.6, -49.7
Galactic (X,Y,Z) coordinates in ly: -9.07, -72.3, -0.40
Proper motion: 0.29 arcsec/yr (251.1° from north)
Radial Velocity: 23.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -13.1, -21.6, -29.1

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.37
Combined visual luminosity: 0.25 x Sol
Observed Separation: 1006 A.U.s
As seen from A:
     B would appear as magnitude -5.63
As seen from B:
     A would appear as magnitude -10.18


Component A:
Spectral class: K1
Luminosity Class: V
Apparent visual magnitude: +8.13
Absolute visual magnitude: +6.38
Visual luminosity: 0.24 x Sol
Color indices: B-V= +0.90, U-B= +0.64, R-I= +0.36
Diameter: 0.8 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.49 A.U.s
Angular size of star in sky in CZ: 0.864015 degrees


Component B:
Catalog numbers:
     Luyten (L) 387-60
Right Ascension and Declination: 8h40m22s, -42°45'36" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -34.5, 41.0, -49.5
Galactic (X,Y,Z) coordinates in ly: -9.49, -72.3, -0.59
Proper motion: 0.306 arcsec/yr (254.0° from north)
Radial Velocity: 23.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -15.2, -21.2, -30.2
Spectral class: M1
Luminosity Class: V
Apparent visual magnitude: +12.68
Absolute visual magnitude: +10.93
Visual luminosity: 0.0037 x Sol
Color indices: B-V= +1.52, U-B= +1.52, R-I= +1.00
Diameter: 0.36 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.061 A.U.s
Angular size of star in sky in CZ: 3.160665 degrees

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