Cape Photographic Durchmusterung -44°3489

Catalog numbers:
Gliese (Gl) 336.2, Henry Draper (HD) 79170, Cape Photographic Durchmusterung (CPD) -44°3489, Hipparcos Input Catalog (HIC) 45072
Arity: binary
Right Ascension and Declination: 9h10m50.09s, -45°18'31" (epoch 2000.0)
Distance from Sol: 257 light-years (79 parsecs)
Standard error in distance: 13.3971%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -134, 122, -183
Galactic (X,Y,Z) coordinates in ly: -8.8, -257, 9.0
Proper motion: 0.18 arcsec/yr (278.0° from north)
Radial Velocity: 18.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -53, -18, -41

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +4.77
Combined visual luminosity: 1.1 x Sol
Observed Separation: 710 A.U.s
Year of separation observation: 1955
As seen from A:
B would appear as magnitude -11.50
As seen from B:
A would appear as magnitude -12.02

Component A:
Spectral class: K0
Luminosity Class: V
Apparent visual magnitude: +9.78
Absolute visual magnitude: +5.29
Visual luminosity: 0.7 x Sol
Color indices: B-V= +0.78, U-B= +0.40
Diameter: 0.69 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.8 A.U.s
Angular size of star in sky in CZ: 0.451282 degrees

Component B:
Catalog numbers:
Luyten (L) 317-2
Spectral class: K0
Luminosity Class: V
Apparent visual magnitude: +10.30
Absolute visual magnitude: +5.81
Visual luminosity: 0.4 x Sol
Color indices: B-V= +0.91, U-B= +0.65
Diameter: 0.67 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.6 A.U.s
Angular size of star in sky in CZ: 0.556774 degrees

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