Gamma Draconis

light-years
Proper names: Gamma Draconis, Etamin, 33 Draconis, Eltanin
Catalog numbers:
     Hoffleit Bright Star (HR) 6705, Bonner Durchmusterung (BD) +51°2282, Henry Draper (HD) 164058, Smithsonian Astrophysical Observatory (SAO) 30653, Fifth Fundamental Catalogue (FK5) 676, Aitken Double Star (ADS) 10923, Hipparcos Input Catalog (HIC) 87833, Caltech 2-microns Survey (IRC) +50274, AGK3 Reference (AGK3R) +51°1174
Heavy element abundance: 112% of Sol
Standard error in heavy element abundance: 81%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 17h56m36.367s, +51°29'20.21" (epoch 2000.0)
Distance from Sol: 148 light-years (45.3 parsecs)
Standard error in distance: 2%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -1.36, -92.0, 116
Galactic (X,Y,Z) coordinates in ly: 24.5, 127, 71.7
Proper motion: 0.021 arcsec/yr (203.0° from north)
Radial Velocity: -27.6 km/sec
Source for proper motion: Fifth Fundamental Catalogue
Source for radial velocity: GCRV (Wilson 1953)
Galactic (U,V,W) velocity components in km/s: -0.39, -25.1, -12.4

What do all these fields mean?


Spectral class: K5
Luminosity Class: III
Apparent visual magnitude: +2.23 (increasing to +2.15)
Absolute visual magnitude: -1.05 (increasing to -1.13)
Visual luminosity: 229 x Sol (increasing to 246 x Sol)
Color indices: B-V= +1.52, U-B= +1.87, R-I= +0.85
Diameter: 58.9 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 15.1 A.U.s
Angular size of star in sky in CZ: 2.075155 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 10-October-2001.