Delta Ursae Majoris

light-years
Proper names: Delta Ursae Majoris, 69 Ursae Majoris, Megrez
Catalog numbers:
     Gliese (Gl) 459, Henry Draper (HD) 106591, Bonner Durchmusterung (BD) +57°1363, Hipparcos Input Catalog (HIC) 59774, Smithsonian Astrophysical Observatory (SAO) 28315, Fifth Fundamental Catalogue (FK5) 456, Hoffleit Bright Star (HR) 4660, New Suspected Variable (NSV) 5513
Arity: singular
Right Ascension and Declination: 12h15m25.56s, +57°1'57.42" (epoch 2000.0)
Distance from Sol: 81.4 light-years (25.0 parsecs)
Standard error in distance: 1.476%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -44.2, -2.98, 68.3
Galactic (X,Y,Z) coordinates in ly: -27.5, 30.4, 70.4
Proper motion: 0.102 arcsec/yr (87.3° from north)
Radial Velocity: -13.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 14.8, 1.26, -10.3

What do all these fields mean?


Spectral class: A3
Luminosity Class: V
Apparent visual magnitude: +3.31
Absolute visual magnitude: +1.33
Visual luminosity: 25.7 x Sol
Color indices: B-V= +0.08, U-B= +0.07
Diameter: 2.17 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 5.07 A.U.s
Angular size of star in sky in CZ: 0.228651 degrees

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