Cordoba Observatory 252

light-years

Catalog numbers:
     Gliese (Gl) 871, Henry Draper (HD) 214953, Cordoba Durchmusterung (CD) -47°14307, Hipparcos Input Catalog (HIC) 112117, Smithsonian Astrophysical Observatory (SAO) 231257, Hoffleit Bright Star (HR) 8635, Cordoba Observatory (COO) 252, New Suspected Variable (NSV) 14277
Arity: binary
Right Ascension and Declination: 22h42m37.085s, -47°12'39.65" (epoch 2000.0)
Distance from Sol: 76.8 light-years (23.5 parsecs)
Standard error in distance: 1.6671%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 49.2, -17.3, -56.4
Galactic (X,Y,Z) coordinates in ly: 39.0, -9.92, -65.4
Proper motion: 0.334 arcsec/yr (175.1° from north)
Radial Velocity: 17.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 12.1, -38.6, -7.21

What do all these fields mean?


Component A:
Spectral class: G1
Luminosity Class: V
Apparent visual magnitude: +6.00
Absolute visual magnitude: +4.14
Visual luminosity: 1.92 x Sol
Color indices: B-V= +0.57, U-B= +0.06, R-I= +0.20
Diameter: 0.94 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.39 A.U.s
Angular size of star in sky in CZ: 0.361427 degrees


Component B:
Spectral class: M1
Luminosity Class: V
Apparent visual magnitude: +11.10
Absolute visual magnitude: +9.24
Visual luminosity: 0.018 x Sol
Color indices: B-V= +1.41
Diameter: 0.49 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.13 A.U.s
Angular size of star in sky in CZ: 1.973053 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 4-April-2001.