Bonner Durchmusterung +57°1274

Catalog numbers:
Gliese (Gl) 397.1, Bonner Durchmusterung (BD) +57°1274, Hipparcos Input Catalog (HIC) 51547, Vyssotsky McCormick (McC) 31, Woolley (Wo) 9331
Arity: binary
Right Ascension and Declination: 10h31m43.34s, +57°6'56.6" (epoch 2000.0)
Distance from Sol: 57.0 light-years (17.5 parsecs)
Standard error in distance: 2.2397%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -28.7, 11.6, 47.9
Galactic (X,Y,Z) coordinates in ly: -31.4, 16.3, 44.8
Proper motion: 0.251 arcsec/yr (325.0° from north)
Radial Velocity: -2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -9.53, 12.5, -13.8

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +8.42
Combined visual luminosity: 0.037 x Sol
Observed Separation: 2483 A.U.s
As seen from A:
B would appear as magnitude +0.39
As seen from B:
A would appear as magnitude -6.18

Component A:
Spectral class: M0e
Luminosity Class: V
Apparent visual magnitude: +9.63
Absolute visual magnitude: +8.42
Visual luminosity: 0.037 x Sol
Color indices: B-V= +1.38, R-I= +0.61
Diameter: 0.68 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.19 A.U.s
Angular size of star in sky in CZ: 1.875883 degrees

Component B:
Catalog numbers:
Luyten Palomar (LP) 92-176
Right Ascension and Declination: 10h28m17s, +57°20'30" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -28.3, 12.0, 48.0
Galactic (X,Y,Z) coordinates in ly: -31.8, 16.4, 44.4
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +16.20
Absolute visual magnitude: +14.99
Visual luminosity: 0.000088 x Sol
Comfort Zone (visual): 0.0094 A.U.s

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