Bonner Durchmusterung -20°465

light-years

Catalog numbers:
     Gliese (Gl) 100, Henry Draper (HD) 15468, Bonner Durchmusterung (BD) -20°465, Luyten Half-Second (LHS) 1409, Hipparcos Input Catalog (HIC) 11565, Smithsonian Astrophysical Observatory (SAO) 167819, UGPMF 36
Arity: trinary
Right Ascension and Declination: 2h29m1.94s, -19°58'44.3" (epoch 2000.0)
Distance from Sol: 61.7 light-years (18.9 parsecs)
Standard error in distance: 3.5552%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 46.1, 35.1, -21.1
Galactic (X,Y,Z) coordinates in ly: -23.5, -8.76, -56.3
Proper motion: 0.689 arcsec/yr (70.6° from north)
Radial Velocity: 23 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -60.3, -26.3, 4.08

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +7.38
Combined visual luminosity: 0.097 x Sol
Observed Separation: 11.3 A.U.s
Year of separation observation: 1951
As seen from A:
     B would appear as magnitude -16.28
As seen from B:
     A would appear as magnitude -18.82

Data for (A-B) and C's orbit around one other:
Combined absolute visual magnitude: +7.35
Combined visual luminosity: 0.100 x Sol
Observed Separation: 8696 A.U.s
As seen from (A-B):
     C would appear as magnitude -0.41
As seen from C:
     (A-B) would appear as magnitude -4.50


Component A:
Spectral class: K4
Luminosity Class: V
Apparent visual magnitude: +8.86
Absolute visual magnitude: +7.48
Visual luminosity: 0.089 x Sol
Color indices: R-I= +0.48
Diameter: 0.78 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.30 A.U.s
Angular size of star in sky in CZ: 1.394421 degrees


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +11.40
Absolute visual magnitude: +10.02
Visual luminosity: 0.0086 x Sol
Comfort Zone (visual): 0.093 A.U.s


Component C:
Catalog numbers:
     Luyten Half-Second (LHS) 1408, Luyten Two-Tenth (LTT) 1226
Right Ascension and Declination: 2h26m12s, -20°15'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 46.5, 34.4, -21.4
Galactic (X,Y,Z) coordinates in ly: -22.9, -8.52, -56.6
Proper motion: 0.668 arcsec/yr (65.7° from north)
Radial Velocity: 23 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -60.7, -20.6, 2.54
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +12.85
Absolute visual magnitude: +11.47
Visual luminosity: 0.0023 x Sol
Color indices: B-V= +1.61, U-B= +1.22, R-I= +1.06
Comfort Zone (visual): 0.047 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.