Theta Persei

light-years
Proper names: Theta Persei, 13 Persei
Catalog numbers:
     Gliese (Gl) 107, Henry Draper (HD) 16895, Bonner Durchmusterung (BD) +48°746, Hipparcos Input Catalog (HIC) 12777, Smithsonian Astrophysical Observatory (SAO) 38288, Aitken Double Star (ADS) 2081, Fifth Fundamental Catalogue (FK5) 93, Hoffleit Bright Star (HR) 799, Struve (STF) 296, New Suspected Variable (NSV) 902
Age: 2900 million years
Source for age: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Heavy element abundance: 81% of Sol
Standard error in heavy element abundance: 23%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 2h44m11.986s, +49°13'42.48" (epoch 2000.0)
Distance from Sol: 36.64 light-years (11.23 parsecs)
Standard error in distance: 0.8795%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 18.04, 15.71, 27.74
Galactic (X,Y,Z) coordinates in ly: -28.34, 22.47, -5.846
Proper motion: 0.346 arcsec/yr (104.0° from north)
Radial Velocity: 24.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -30.55, 1.198, -0.213

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +3.87
Combined visual luminosity: 2.459 x Sol
Period: 2720 years
Semimajor Axis: 250.4 A.U.s
Eccentricity: 0.13
Periastron distance: 217.8 A.U.s
Apastron distance: 282.9 A.U.s
Year in which periastron occurs: 1613
Source for orbit data: J. Hopmann
As seen from A:
     At periastron, B would appear as magnitude -10.07
     At apastron, B would appear as magnitude -9.51
As seen from B:
     At periastron, A would appear as magnitude -16.00
     At apastron, A would appear as magnitude -15.44


Component A:
Spectral class: F7
Luminosity Class: V
Apparent visual magnitude: +4.13
Absolute visual magnitude: +3.88
Visual luminosity: 2.449 x Sol
Color indices: B-V= +0.49, U-B= +0.00, R-I= +0.18
Mass: 1.06 x Sol
Diameter: 1.690 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.565 A.U.s
Orbital period in CZ: 1.90133 years
Tidal index in CZ: 0.276622
Angular size of star in sky in CZ: 0.575760 degrees


Component B:
Proper motion: 0.346 arcsec/yr (104.0° from north)
Radial Velocity: 25.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -31.09, 1.627, -0.325
Spectral class: M1
Luminosity Class: V
Apparent visual magnitude: +10.06
Absolute visual magnitude: +9.81
Visual luminosity: 0.0104 x Sol
Color indices: B-V= +1.48, R-I= +0.89
Mass: 0.3 x Sol
Diameter: 0.58 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.102 A.U.s
Orbital period in CZ: 21.7096 days
Tidal index in CZ: 283.059
Angular size of star in sky in CZ: 3.032709 degrees

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