Psi(1) Draconis

light-years
Proper names: Psi(1) Draconis, 31 Draconis, Psi Draconis
Catalog numbers:
     Gliese (Gl) 694.1, Aitken Double Star (ADS) 10759, Fifth Fundamental Catalogue (FK5) 670, Struve (STF) 2241, Woolley (Wo) 9602
Age: 4900 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Heavy element abundance: 96% of Sol
Standard error in heavy element abundance: 13%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 17h41m56.342s, +72°8'55.89" (epoch 2000.0)
Distance from Sol: 71.9 light-years (22.0 parsecs)
Standard error in distance: 1.7749%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -1.73, -22.0, 68.4
Galactic (X,Y,Z) coordinates in ly: -13.8, 60.0, 37.1
Proper motion: 0.268 arcsec/yr (177.0° 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: 30.1, -6.12, -5.45

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +2.57
Combined visual luminosity: 8.18 x Sol
Observed Separation: 661 A.U.s
As seen from A:
     B would appear as magnitude -13.38
As seen from B:
     A would appear as magnitude -14.60


Component A:
Catalog numbers:
     Henry Draper (HD) 162003, Bonner Durchmusterung (BD) +72°804, Hipparcos Input Catalog (HIC) 86614, Smithsonian Astrophysical Observatory (SAO) 8890, Hoffleit Bright Star (HR) 6636
Spectral class: F5
Luminosity Class: IV-V
Apparent visual magnitude: +4.59
Absolute visual magnitude: +2.87
Visual luminosity: 6.17 x Sol
Color indices: B-V= +0.42, U-B= +0.01
Diameter: 2.37 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.48 A.U.s
Angular size of star in sky in CZ: 0.508281 degrees


Component B:
Catalog numbers:
     Henry Draper (HD) 162004, Bonner Durchmusterung (BD) +72°805, Hipparcos Input Catalog (HIC) 86620, Smithsonian Astrophysical Observatory (SAO) 8891, Hoffleit Bright Star (HR) 6637
Right Ascension and Declination: 17h41m58.35s, +72°9'24" (epoch 2000.0)
Celestial (X,Y,Z) coordinates in ly: -1.73, -22.0, 68.4
Galactic (X,Y,Z) coordinates in ly: -13.8, 60.0, 37.1
Proper motion: 0.277 arcsec/yr (175.1° from north)
Radial Velocity: -10.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 30.4, -3.11, -4.77
Spectral class: F8
Luminosity Class: V
Apparent visual magnitude: +5.81
Absolute visual magnitude: +4.09
Visual luminosity: 2.01 x Sol
Color indices: B-V= +0.53, U-B= +0.02
Diameter: 1.05 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.42 A.U.s
Angular size of star in sky in CZ: 0.394879 degrees

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