61 Ursae Majoris

light-years
Proper names: 61 Ursae Majoris
Catalog numbers:
     Gliese (Gl) 434, Henry Draper (HD) 101501, Bonner Durchmusterung (BD) +35°2270, Hipparcos Input Catalog (HIC) 56997, Smithsonian Astrophysical Observatory (SAO) 62655, Fifth Fundamental Catalogue (FK5) 1300, Hoffleit Bright Star (HR) 4496, New Suspected Variable (NSV) 5291
Age: 500 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Heavy element abundance: 73% of Sol
Standard error in heavy element abundance: 26%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 11h41m3.02s, +34°12'5.79" (epoch 2000.0)
Distance from Sol: 31.12 light-years (9.541 parsecs)
Standard error in distance: 0.6823%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -25.65, 2.126, 17.49
Galactic (X,Y,Z) coordinates in ly: -8.589, -0.572, 29.90
Proper motion: 0.386 arcsec/yr (181.9° from north)
Radial Velocity: -5.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 8.049, -16.05, -4.133

What do all these fields mean?


Spectral class: G8e
Luminosity Class: V
Apparent visual magnitude: +5.32
Absolute visual magnitude: +5.43
Visual luminosity: 0.589 x Sol
Color indices: B-V= +0.72, U-B= +0.25, R-I= +0.27
Mass: 0.81 x Sol
Diameter: 0.923 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.767 A.U.s
Orbital period in CZ: 272.795 days
Tidal index in CZ: 1.7927
Angular size of star in sky in CZ: 0.641167 degrees

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