Eta Draconis
Proper names: Eta Draconis, 14 Draconis
Catalog numbers:
Gliese (Gl) 624.1, Henry Draper (HD) 148387, Bonner Durchmusterung (BD) +61°1591, Hipparcos Input Catalog (HIC) 80331, Smithsonian Astrophysical Observatory (SAO) 17074, Aitken Double Star (ADS) 10058, Hoffleit Bright Star (HR) 6132, New Suspected Variable (NSV) 7712, Woolley (Wo) 9561, Caltech 2-microns Survey (IRC) +60°242
Heavy element abundance: 85% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 16h23m59.455s, +61°30'51.94" (epoch 2000.0)
Distance from Sol: 87.7 light-years (26.9 parsecs)
Standard error in distance: 1.1959%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -17.0, -38.2, 77.1
Galactic (X,Y,Z) coordinates in ly: -2.78, 66.2, 57.5
Proper motion: 0.08 arcsec/yr (338.0° from north)
Radial Velocity: -13.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -9.72, -11.2, -8.52
What do all these fields mean?
Data for A and B's orbit around one other:
Combined absolute visual magnitude: +0.59
Combined visual luminosity: 50.7 x Sol
Observed Separation: 125 A.U.s
Source for orbit data: Burnham's Celestial Handbook
As seen from A:
B would appear as magnitude -14.44
As seen from B:
A would appear as magnitude -20.50
Component A:
Spectral class: G8
Luminosity Class: III
Apparent visual magnitude: +2.74
Absolute visual magnitude: +0.59
Visual luminosity: 50.5 x Sol
Color indices: B-V= +0.91, U-B= +0.70
Diameter: 10.1 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 7.11 A.U.s
Angular size of star in sky in CZ: 0.756670 degrees
Component B:
Spectral class: K2
Luminosity Class: V
Apparent visual magnitude: +8.80
Absolute visual magnitude: +6.65
Visual luminosity: 0.19 x Sol
Comfort Zone (visual): 0.44 A.U.s
Data for this star system were most recently updated on 4-April-2001.