Cordoba Durchmusterung -39°10940

Catalog numbers:
Gliese (Gl) 646, Henry Draper (HD) 153026, Cordoba Durchmusterung (CD) -39°10940, Hipparcos Input Catalog (HIC) 83101, Smithsonian Astrophysical Observatory (SAO) 208258
Arity: binary
Right Ascension and Declination: 16h58m54.09s, -39°33'32.1" (epoch 2000.0)
Distance from Sol: 62.4 light-years (19.1 parsecs)
Standard error in distance: 3.7718%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -12.7, -46.4, -39.7
Galactic (X,Y,Z) coordinates in ly: 60.5, -14.9, 1.45
Proper motion: 0.331 arcsec/yr (55.6° from north)
Radial Velocity: 42.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 48.3, 17.6, -8.06

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.92
Combined visual luminosity: 0.15 x Sol
Observed Separation: 74.6 A.U.s
Year of separation observation: 1931
As seen from A:
B would appear as magnitude -13.22
As seen from B:
A would appear as magnitude -15.12

Component A:
Spectral class: K5
Luminosity Class: V
Apparent visual magnitude: +8.50
Absolute visual magnitude: +7.09
Visual luminosity: 0.13 x Sol
Diameter: 0.7 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.36 A.U.s
Angular size of star in sky in CZ: 1.048188 degrees

Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +10.40
Absolute visual magnitude: +8.99
Visual luminosity: 0.022 x Sol
Diameter: 0.56 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.15 A.U.s
Angular size of star in sky in CZ: 2.011629 degrees

Data for this star system were most recently updated on 4-April-2001.