Bonner Durchmusterung +21°1764

light-years

Catalog numbers:
     Bonner Durchmusterung (BD) +21°1764, Giclas (G) 40-7, Hipparcos Input Catalog (HIC) 39826
Arity: binary
Right Ascension and Declination: 8h8m13.21s, +21°6'17.2" (epoch 2000.0)
Distance from Sol: 55.8 light-years (17.1 parsecs)
Standard error in distance: 4.1195%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -27.6, 44.1, 20.1
Galactic (X,Y,Z) coordinates in ly: -46.4, -18.5, 24.9
Proper motion: 0.466 arcsec/yr (221.3° 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: +8.32
Combined visual luminosity: 0.041 x Sol
Observed Separation: 154 A.U.s
As seen from A:
     B would appear as magnitude -10.80
As seen from B:
     A would appear as magnitude -12.00


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 5133, Luyten Two-Tenth (LTT) 12130
Spectral class: K5
Luminosity Class: V-VI
Apparent visual magnitude: +9.80
Absolute visual magnitude: +8.63
Visual luminosity: 0.031 x Sol
Comfort Zone (visual): 0.18 A.U.s


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 5134, Luyten Two-Tenth (LTT) 12131
Right Ascension and Declination: 8h5m18s, +21°15'12" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -27.1, 44.4, 20.2
Galactic (X,Y,Z) coordinates in ly: -46.8, -18.3, 24.4
Proper motion: 0.487 arcsec/yr (227.2° from north)
Source for proper motion: Gliese
Spectral class: M
Luminosity Class: V-VI
Apparent visual magnitude: +11.00
Absolute visual magnitude: +9.83
Visual luminosity: 0.010 x Sol
Comfort Zone (visual): 0.10 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.