Wolf 922

Catalog numbers:
Gliese (Gl) 831, Giclas (G) 26-7, Luyten Half-Second (LHS) 511, Hipparcos Input Catalog (HIC) 106255, Wolf 922
Arity: binary
Right Ascension and Declination: 21h31m18.641s, -9°47'25.75" (epoch 2000.0)
Distance from Sol: 26.0 light-years (7.96 parsecs)
Standard error in distance: 3.4589%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: 20.4, -15.5, -4.42
Galactic (X,Y,Z) coordinates in ly: 14.3, 13.7, -16.8
Proper motion: 1.194 arcsec/yr (90.8° from north)
Radial Velocity: -56.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -64.0, -33.3, 6.09

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +12.47
Combined visual luminosity: 0.00090 x Sol
Observed Separation: 1.74 A.U.s
Source for orbit data: A&AS 71, p. 57
As seen from A:
B would appear as magnitude -14.98
As seen from B:
A would appear as magnitude -17.83

Component A:
Spectral class: M4.5e
Luminosity Class: V
Apparent visual magnitude: +12.05
Absolute visual magnitude: +12.54
Visual luminosity: 0.00084 x Sol
Diameter: 0.29 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.029 A.U.s
Angular size of star in sky in CZ: 5.349093 degrees

Component B:
Apparent visual magnitude: +14.90
Absolute visual magnitude: +15.39
Visual luminosity: 0.000061 x Sol
Comfort Zone (visual): 0.0078 A.U.s

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