Bellatrix

light-years
Proper names: Bellatrix, Gamma Orionis, 24 Orionis, The Amazon Star
Catalog numbers:
     Henry Draper (HD) 35468, Bonner Durchmusterung (BD) +6°919, Hoffleit Bright Star (HR) 1790, Smithsonian Astrophysical Observatory (SAO) 112740, Fifth Fundamental Catalogue (FK5) 201, Hipparcos Input Catalog (HIC) 25336, Caltech 2-microns Survey (IRC) +10084, New Suspected Variable (NSV) 1972
Arity: possible spectroscopic binary
Right Ascension and Declination: 5h25m7.857s, +6°20'58.74" (epoch 2000.0)
Distance from Sol: 243 light-years (74.5 parsecs)
Standard error in distance: 6.8056%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 36.6, 239, 26.9
Galactic (X,Y,Z) coordinates in ly: -224, -69.5, -64.4
Proper motion: 0.0166 arcsec/yr (212.7° from north)
Radial Velocity: 18.2 km/sec
Source for proper motion and radial velocity: Hipparcos Input Catalog
Galactic (U,V,W) velocity components in km/s: -14.7, -7.30, -9.88

What do all these fields mean?


Spectral class: B2
Luminosity Class: III-V
Apparent visual magnitude: +1.64
Absolute visual magnitude: -2.73
Visual luminosity: 1072 x Sol
Color indices: B-V= -0.22
Diameter: 5.77 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 32.7 A.U.s
Angular size of star in sky in CZ: 0.093882 degrees

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