BF Canum Venaticorum

light-years

Catalog numbers:
     Gliese (Gl) 490, Bonner Durchmusterung (BD) +36°2322, Hipparcos Input Catalog (HIC) 63253, Vyssotsky McCormick (McC) 298
Arity: binary
Right Ascension and Declination: 12h57m40.289s, +35°13'30.33" (epoch 2000.0)
Distance from Sol: 59.0 light-years (18.1 parsecs)
Standard error in distance: 5.392%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -46.7, -12.0, 34.0
Galactic (X,Y,Z) coordinates in ly: -2.84, 7.74, 58.4
Proper motion: 0.26 arcsec/yr (244.0° from north)
Radial Velocity: -6.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -10.8, -20.1, -4.83

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +9.29
Combined visual luminosity: 0.017 x Sol
Observed Separation: 308 A.U.s
As seen from A:
     B would appear as magnitude -7.22
As seen from B:
     A would appear as magnitude -9.74


Component A:
Proper names: BF Canum Venaticorum
Catalog numbers:
     Giclas (G) 123-75
Spectral class: M0e
Luminosity Class: V
Apparent visual magnitude: +10.68 (increasing to +10.58)
Absolute visual magnitude: +9.39 (increasing to +9.29)
Visual luminosity: 0.015 x Sol (increasing to 0.017 x Sol)
Variable type: BY Draconis (rotating variable)
Period of variability: 3.1 days
Color indices: B-V= +1.44, U-B= +1.13, R-I= +0.84
Diameter: 0.63 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.12 A.U.s
Angular size of star in sky in CZ: 2.720775 degrees


Component B:
Catalog numbers:
     Giclas (G) 164-31
Right Ascension and Declination: 12h55m18s, +35°29'36" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -46.7, -11.5, 34.3
Galactic (X,Y,Z) coordinates in ly: -3.41, 7.69, 58.4
Proper motion: 0.26 arcsec/yr (244.0° from north)
Radial Velocity: -2.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -11.1, -19.5, -0.91
Spectral class: M4e
Luminosity Class: V
Apparent visual magnitude: +13.20
Absolute visual magnitude: +11.91
Visual luminosity: 0.0015 x Sol
Color indices: B-V= +1.64, U-B= +1.14, R-I= +1.26
Diameter: 0.37 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.039 A.U.s
Angular size of star in sky in CZ: 5.100098 degrees

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