TW Piscis Austrini

light-years
Proper names: TW Piscis Austrini
Catalog numbers:
     Gliese (Gl) 879, Henry Draper (HD) 216803, Cordoba Durchmusterung (CD) -3217321, Hipparcos Input Catalog (HIC) 113283, Smithsonian Astrophysical Observatory (SAO) 214197, UGPMF 584, Hoffleit Bright Star (HR) 8721
Arity: singular
Right Ascension and Declination: 22h56m24.048s, -31°33'56" (epoch 2000.0)
Distance from Sol: 24.91 light-years (7.637 parsecs)
Standard error in distance: 0.6977%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 20.41, -5.814, -13.04
Galactic (X,Y,Z) coordinates in ly: 10.01, 2.968, -22.61
Proper motion: 0.36 arcsec/yr (114.6° from north)
Radial Velocity: 9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -4.809, -7.599, -13.04

What do all these fields mean?


Spectral class: K5e
Luminosity Class: V
Apparent visual magnitude: +6.48 (increasing to +6.38)
Absolute visual magnitude: +7.07 (increasing to +6.97)
Visual luminosity: 0.130 x Sol (increasing to 0.142 x Sol)
Variable type: BY Draconis (rotating variable)
Color indices: B-V= +1.10, U-B= +1.02, R-I= +0.41
Diameter: 0.903 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.360 A.U.s
Angular size of star in sky in CZ: 1.336403 degrees

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