Bonner Durchmusterung -51844

light-years

Catalog numbers:
     Gliese (Gl) 250, Henry Draper (HD) 50281, Bonner Durchmusterung (BD) -51844, Hipparcos Input Catalog (HIC) 32984, Smithsonian Astrophysical Observatory (SAO) 133805, UGPMF 148
Arity: binary
Right Ascension and Declination: 6h52m18.09s, -5°10'24.9" (epoch 2000.0)
Distance from Sol: 28.38 light-years (8.700 parsecs)
Standard error in distance: 0.7427%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -6.394, 27.53, -2.559
Galactic (X,Y,Z) coordinates in ly: -22.36, -17.45, -0.817
Proper motion: 0.544 arcsec/yr (269.8° from north)
Radial Velocity: -9.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 1.709, 14.33, -19.68

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.82
Combined visual luminosity: 0.163 x Sol
Observed Separation: 522.0 A.U.s
As seen from A:
     B would appear as magnitude -7.59
As seen from B:
     A would appear as magnitude -11.12


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 1875
Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +6.56
Absolute visual magnitude: +6.86
Visual luminosity: 0.157 x Sol
Color indices: B-V= +1.05, U-B= +0.95, R-I= +0.39
Mass: 0.6 x Sol
Diameter: 0.972 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.396 A.U.s
Orbital period in CZ: 117.43 days
Tidal index in CZ: 9.67443
Angular size of star in sky in CZ: 1.309713 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 1876
Right Ascension and Declination: 6h49m52s, -5°7'42" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -6.101, 27.60, -2.537
Galactic (X,Y,Z) coordinates in ly: -22.45, -17.32, -1.073
Proper motion: 0.541 arcsec/yr (270.0° from north)
Radial Velocity: -6.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -0.209, 12.78, -19.55
Spectral class: M2
Luminosity Class: V
Apparent visual magnitude: +10.09
Absolute visual magnitude: +10.39
Visual luminosity: 0.00607 x Sol
Color indices: B-V= +1.50, U-B= +1.26, R-I= +0.98
Mass: 0.24 x Sol
Diameter: 0.49 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0779 A.U.s
Orbital period in CZ: 16.2067 days
Tidal index in CZ: 507.913
Angular size of star in sky in CZ: 3.353820 degrees

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