72 Herculis

light-years
Proper names: 72 Herculis
Catalog numbers:
     Gliese (Gl) 672, Henry Draper (HD) 157214, Bonner Durchmusterung (BD) +32°2896, Luyten Half-Second (LHS) 441, Hipparcos Input Catalog (HIC) 84862, Smithsonian Astrophysical Observatory (SAO) 65963, Fifth Fundamental Catalogue (FK5) 1456, Hoffleit Bright Star (HR) 6458, New Suspected Variable (NSV) 8853
Age: 7600 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Heavy element abundance: 47% of Sol
Standard error in heavy element abundance: 15%
Source for heavy element abundance: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Arity: singular
Points of interest:
     B. Edvardsson et al. list an age of over 17 thousand-million years for this star, which cannot be true — it would make this star older than our current estimates for the age of the universe!

Right Ascension and Declination: 17h20m39.571s, +32°28'3.88" (epoch 2000.0)
Distance from Sol: 46.94 light-years (14.39 parsecs)
Standard error in distance: 0.7995%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -6.765, -39.02, 25.20
Galactic (X,Y,Z) coordinates in ly: 22.33, 33.00, 24.82
Proper motion: 1.05 arcsec/yr (173.0° from north)
Radial Velocity: -79.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 25.37, -81.64, -63.87

What do all these fields mean?


Spectral class: G2
Luminosity Class: V
Apparent visual magnitude: +5.39
Absolute visual magnitude: +4.60
Visual luminosity: 1.256 x Sol
Color indices: B-V= +0.62, U-B= +0.07, R-I= +0.24
Diameter: 0.99 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.121 A.U.s
Angular size of star in sky in CZ: 0.470880 degrees

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