Pi(1) Ursae Majoris

light-years
Proper names: Pi(1) Ursae Majoris, 3 Ursae Majoris, Pi Ursae Majoris
Catalog numbers:
     Gliese (Gl) 311, Henry Draper (HD) 72905, Bonner Durchmusterung (BD) +65°643, Hipparcos Input Catalog (HIC) 42438, Smithsonian Astrophysical Observatory (SAO) 14609, Hoffleit Bright Star (HR) 3391
Age: 10 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Heavy element abundance: 79% of Sol
Standard error in heavy element abundance: 11%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 8h39m11.739s, +65°1'15.25" (epoch 2000.0)
Distance from Sol: 46.5 light-years (14.3 parsecs)
Standard error in distance: 1.0031%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -12.6, 15.1, 42.2
Galactic (X,Y,Z) coordinates in ly: -32.7, 18.4, 27.5
Proper motion: 0.089 arcsec/yr (344.5° from north)
Radial Velocity: -12.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 10.1, 0.42, -9.80

What do all these fields mean?


Spectral class: G1
Luminosity Class: V
Apparent visual magnitude: +5.63
Absolute visual magnitude: +4.86
Visual luminosity: 0.99 x Sol
Color indices: B-V= +0.62, U-B= +0.07, R-I= +0.21
Mass: 1 x Sol
Diameter: 0.97 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.00 A.U.s
Orbital period in CZ: 362.821 days
Tidal index in CZ: 1.01344
Angular size of star in sky in CZ: 0.517444 degrees

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