Fomalhaut

light-years
Proper names: Fomalhaut, Alpha Piscis Austrini, 24 Piscis Austrini
Catalog numbers:
     Gliese (Gl) 881, Henry Draper (HD) 216956, Cordoba Durchmusterung (CD) -3019370, Hipparcos Input Catalog (HIC) 113368, Smithsonian Astrophysical Observatory (SAO) 191524, Fifth Fundamental Catalogue (FK5) 867, Hoffleit Bright Star (HR) 8728, New Suspected Variable (NSV) 14372, Luyten Two-Tenth (LTT) 9292
Arity: singular
Right Ascension and Declination: 22h57m39.055s, -29°37'20.1" (epoch 2000.0)
Distance from Sol: 25.07 light-years (7.688 parsecs)
Standard error in distance: 0.7023%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 21.00, -5.857, -12.39
Galactic (X,Y,Z) coordinates in ly: 9.693, 3.755, -22.82
Proper motion: 0.372 arcsec/yr (115.6° from north)
Radial Velocity: 6.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -6.170, -8.288, -10.69

What do all these fields mean?


Spectral class: A3
Luminosity Class: V
Apparent visual magnitude: +1.17
Absolute visual magnitude: +1.74
Visual luminosity: 17.59 x Sol
Color indices: B-V= +0.09, U-B= +0.08, R-I= -0.06
Mass: 2.3 x Sol
Diameter: 1.719 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 4.194 A.U.s
Orbital period in CZ: 5.66327 years
Tidal index in CZ: 0.031179
Angular size of star in sky in CZ: 0.218452 degrees

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