BY Draconis

light-years
Proper names: BY Draconis
Catalog numbers:
     Gliese (Gl) 719, Henry Draper Extension (HDE) 234677, Bonner Durchmusterung (BD) +51°2402, Giclas (G) 227-36, Hipparcos Input Catalog (HIC) 91009, Smithsonian Astrophysical Observatory (SAO) 31048
Heavy element abundance: 113% of Sol
Standard error in heavy element abundance: 11%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 18h33m55.808s, +51°43'8.62" (epoch 2000.0)
Distance from Sol: 53.6 light-years (16.4 parsecs)
Standard error in distance: 1.1845%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 4.89, -32.8, 42.0
Galactic (X,Y,Z) coordinates in ly: 7.98, 48.5, 21.3
Proper motion: 0.376 arcsec/yr (151.0° from north)
Radial Velocity: -24.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 18.4, -17.6, -28.4

What do all these fields mean?


Spectral class: K6e
Luminosity Class: V
Apparent visual magnitude: +8.48 (increasing to +7.98)
Absolute visual magnitude: +7.40 (increasing to +6.90)
Visual luminosity: 0.095 x Sol (increasing to 0.15 x Sol)
Variable type: BY Draconis (rotating variable)
Color indices: B-V= +1.22, U-B= +1.04
Diameter: 1.38 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.31 A.U.s
Angular size of star in sky in CZ: 2.378169 degrees

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