Eta Boötis

light-years
Proper names: Eta Boötis, 8 Boötis, Muphrid, Eta Bootis, 8 Bootis
Catalog numbers:
     Gliese (Gl) 534, Henry Draper (HD) 121370, Bonner Durchmusterung (BD) +19°2725, Hipparcos Input Catalog (HIC) 67927, Smithsonian Astrophysical Observatory (SAO) 100766, Fifth Fundamental Catalogue (FK5) 513, Hoffleit Bright Star (HR) 5235
Age: 2800 million years
Source for age: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Heavy element abundance: 190% of Sol
Source for heavy element abundance: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Arity: singular
Right Ascension and Declination: 13h54m41.074s, +18°23'51.72" (epoch 2000.0)
Distance from Sol: 36.99 light-years (11.34 parsecs)
Standard error in distance: 0.8435%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -30.80, -16.84, 11.68
Galactic (X,Y,Z) coordinates in ly: 11.12, 1.103, 35.27
Proper motion: 0.369 arcsec/yr (190.0° from north)
Radial Velocity: 1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 9.683, -17.28, -1.463

What do all these fields mean?


NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Spectral class: G0
Luminosity Class: IV
Apparent visual magnitude: +2.68
Absolute visual magnitude: +2.41
Visual luminosity: 9.493 x Sol
Color indices: B-V= +0.58, U-B= +0.20, R-I= +0.20
Diameter: 2.609 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 3.081 A.U.s
Angular size of star in sky in CZ: 0.451349 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 12-May-2001.