Epsilon Canis Majoris

light-years
Proper names: Adhara, Adara, Epsilon Canis Majoris, 21 Canis Majoris
Catalog numbers:
     Cordoba Durchmusterung (CD) -28°3666, Henry Draper (HD) 52089, Smithsonian Astrophysical Observatory (SAO) 172676, Fifth Fundamental Catalogue (FK5) 268, Aitken Double Star (ADS) 5654, Hoffleit Bright Star (HR) 2618, Cape Photographic Durchmusterung (CPD) -28°1586, Caltech 2-microns Survey (IRC) -30071, Hipparcos Input Catalog (HIC) 33579
Arity: binary
Right Ascension and Declination: 6h58m37.548s, -28°58'19.5" (epoch 2000.0)
Distance from Sol: 431 light-years (132 parsecs)
Standard error in distance: 7%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -95.4, 365, -209
Galactic (X,Y,Z) coordinates in ly: -211, -367, -82.0
Proper motion: 0.005 arcsec/yr (53.0° from north)
Radial Velocity: 27.3 km/sec
Source for proper motion: Fifth Fundamental Catalogue
Source for radial velocity: Evans 1978
Galactic (U,V,W) velocity components in km/s: -14.2, -23.4, -2.18

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: -4.11
Combined visual luminosity: 3831 x Sol
Observed Separation: 991 A.U.s
Source for orbit data: Hoffleit Bright Star
As seen from A:
     B would appear as magnitude -14.80
As seen from B:
     A would appear as magnitude -20.70


Component A:
Spectral class: B2
Luminosity Class: II
Apparent visual magnitude: +1.50
Absolute visual magnitude: -4.10
Visual luminosity: 3815 x Sol
Color indices: B-V= -0.21, U-B= -0.93, R-I= -0.21
Diameter: 10.9 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 61.8 A.U.s
Angular size of star in sky in CZ: 0.094390 degrees


Component B:
Apparent visual magnitude: +7.40
Absolute visual magnitude: +1.79
Visual luminosity: 16.7 x Sol
Comfort Zone (visual): 4.08 A.U.s

light-years
but not more than light-years away
Data for this star system were most recently updated on 30-September-2001.