Alpha(1) Librae

light-years
Proper names: Alpha(1) Librae, 8 Librae, Alpha Librae
Catalog numbers:
     Gliese (Gl) 563.4, Henry Draper (HD) 130819, Bonner Durchmusterung (BD) -15°3965, Hipparcos Input Catalog (HIC) 72603, Smithsonian Astrophysical Observatory (SAO) 158836, Fifth Fundamental Catalogue (FK5) 1387, Hoffleit Bright Star (HR) 5530, Woolley (Wo) 9498
Heavy element abundance: 72% of Sol
Standard error in heavy element abundance: 3%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: singular
Right Ascension and Declination: 14h50m41.207s, -15°59'50.14" (epoch 2000.0)
Distance from Sol: 77.2 light-years (23.7 parsecs)
Standard error in distance: 2.4018%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -54.5, -50.3, -21.3
Galactic (X,Y,Z) coordinates in ly: 57.8, -20.1, 47.0
Proper motion: 0.123 arcsec/yr (235.2° from north)
Radial Velocity: -23.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -22.1, -6.94, -14.4

What do all these fields mean?


NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Spectral class: F5
Luminosity Class: IV-V
Apparent visual magnitude: +5.15
Absolute visual magnitude: +3.28
Visual luminosity: 4.24 x Sol
Color indices: B-V= +0.41, U-B= -0.03, R-I= +0.11
Diameter: 1.08 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.06 A.U.s
Angular size of star in sky in CZ: 0.279483 degrees

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