Bonner Durchmusterung +15°4074

light-years

Catalog numbers:
     Gliese (Gl) 783.2, Henry Draper (HD) 191785, Bonner Durchmusterung (BD) +15°4074, Hipparcos Input Catalog (HIC) 99452, Smithsonian Astrophysical Observatory (SAO) 105793
Arity: binary
Right Ascension and Declination: 20h11m6.092s, +16°11'16.95" (epoch 2000.0)
Distance from Sol: 66.8 light-years (20.5 parsecs)
Standard error in distance: 1.8295%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 34.7, -53.9, 18.6
Galactic (X,Y,Z) coordinates in ly: 35.7, 55.3, -11.4
Proper motion: 0.574 arcsec/yr (314.7° from north)
Radial Velocity: -48.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -30.7, -25.7, 61.9

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +5.77
Combined visual luminosity: 0.43 x Sol
Observed Separation: 2089 A.U.s
As seen from A:
     B would appear as magnitude -2.59
As seen from B:
     A would appear as magnitude -9.20


Component A:
Catalog numbers:
     Giclas (G) 143-34, Luyten Half-Second (LHS) 3529
Spectral class: K1
Luminosity Class: V
Apparent visual magnitude: +7.33
Absolute visual magnitude: +5.78
Visual luminosity: 0.43 x Sol
Color indices: B-V= +0.85, U-B= +0.49, R-I= +0.30
Comfort Zone (visual): 0.65 A.U.s


Component B:
Catalog numbers:
     Giclas (G) 143-35, Luyten Half-Second (LHS) 3530
Right Ascension and Declination: 20h8m57s, +16°1'48" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 34.2, -54.3, 18.4
Galactic (X,Y,Z) coordinates in ly: 36.2, 55.1, -11.0
Proper motion: 0.572 arcsec/yr (312.9° from north)
Radial Velocity: -48.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -29.8, -26.7, 61.8
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +13.94
Absolute visual magnitude: +12.38
Visual luminosity: 0.00097 x Sol
Color indices: B-V= +1.62, U-B= +1.14, R-I= +1.24
Comfort Zone (visual): 0.031 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.