Alpha Cephei

light-years
Proper names: Alpha Cephei, 5 Cephei, Alderamin
Catalog numbers:
     Gliese (Gl) 826, Henry Draper (HD) 203280, Bonner Durchmusterung (BD) +61°2111, Hipparcos Input Catalog (HIC) 105199, Smithsonian Astrophysical Observatory (SAO) 19302, Fifth Fundamental Catalogue (FK5) 803, Hoffleit Bright Star (HR) 8162, New Suspected Variable (NSV) 13660
Arity: singular
Right Ascension and Declination: 21h18m34.769s, +62°35'8.08" (epoch 2000.0)
Distance from Sol: 48.80 light-years (14.96 parsecs)
Standard error in distance: 0.7278%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 17.12, -14.55, 43.32
Galactic (X,Y,Z) coordinates in ly: -9.398, 47.24, 7.821
Proper motion: 0.158 arcsec/yr (70.5° from north)
Radial Velocity: -11.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -7.809, -12.32, -6.711

What do all these fields mean?


Spectral class: A7
Luminosity Class: IV-V
Apparent visual magnitude: +2.45
Absolute visual magnitude: +1.58
Visual luminosity: 20.40 x Sol
Color indices: B-V= +0.22, U-B= +0.11, R-I= +0.02
Diameter: 1.897 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 4.516 A.U.s
Angular size of star in sky in CZ: 0.223961 degrees

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