Zeta Herculis

light-years
Proper names: Zeta Herculis, 40 Herculis
Catalog numbers:
     Gliese (Gl) 635, Henry Draper (HD) 150680, Bonner Durchmusterung (BD) +312884, Luyten Half-Second (LHS) 3234, Hipparcos Input Catalog (HIC) 81693, Smithsonian Astrophysical Observatory (SAO) 65485, Aitken Double Star (ADS) 10157, Hoffleit Bright Star (HR) 6212, Struve (STF) 2084, New Suspected Variable (NSV) 7915
Heavy element abundance: 150% of Sol
Standard error in heavy element abundance: 21%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: Both components are possible spectroscopic binari
Right Ascension and Declination: 16h41m17.213s, +31°36'10.69" (epoch 2000.0)
Distance from Sol: 35.21 light-years (10.80 parsecs)
Standard error in distance: 0.6436%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -10.10, -28.24, 18.45
Galactic (X,Y,Z) coordinates in ly: 16.40, 21.48, 22.57
Proper motion: 0.614 arcsec/yr (309.9° from north)
Radial Velocity: -70.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -55.57, -47.73, -24.03

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +2.64
Combined visual luminosity: 7.661 x Sol
Period: 34.487 years
Semimajor Axis: 14.63 A.U.s
Eccentricity: 0.46
Periastron distance: 7.899 A.U.s
Apastron distance: 21.36 A.U.s
Year in which periastron occurs: 1967.8
Source for orbit data: P. Baize
As seen from A:
     At periastron, B would appear as magnitude -21.85
     At apastron, B would appear as magnitude -19.69
As seen from B:
     At periastron, A would appear as magnitude -24.34
     At apastron, A would appear as magnitude -22.18


Component A:
Spectral class: G0
Luminosity Class: IV
Apparent visual magnitude: +2.91
Absolute visual magnitude: +2.74
Visual luminosity: 6.959 x Sol
Mass: 1.14 x Sol
Source for mass: Burnham's Celestial Handbook
Diameter: 2.553 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.638 A.U.s
Orbital period in CZ: 4.01284 years
Tidal index in CZ: 0.062101
Angular size of star in sky in CZ: 0.515852 degrees


Component B:
Spectral class: K0
Luminosity Class: V
Apparent visual magnitude: +5.40
Absolute visual magnitude: +5.23
Visual luminosity: 0.702 x Sol
Mass: 0.82 x Sol
Source for mass: Burnham's Celestial Handbook
Diameter: 0.862 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.838 A.U.s
Orbital period in CZ: 309.422 days
Tidal index in CZ: 1.39341
Angular size of star in sky in CZ: 0.548378 degrees

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