Tau Sagittarii

light-years
Proper names: Tau Sagittarii, 40 Sagittarii
Catalog numbers:
     Woolley (Wo) 9643, Henry Draper (HD) 177716, Cordoba Durchmusterung (CD) -27°13564, Hipparcos Input Catalog (HIC) 93864, Smithsonian Astrophysical Observatory (SAO) 187683, Fifth Fundamental Catalogue (FK5) 1496, Hoffleit Bright Star (HR) 7234, Luyten Two-Tenth (LTT) 7571
Arity: singular
Right Ascension and Declination: 19h6m56.415s, -27°40'13.57" (epoch 2000.0)
Distance from Sol: 120 light-years (36.9 parsecs)
Standard error in distance: 5.1803%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 30.7, -102, -55.9
Galactic (X,Y,Z) coordinates in ly: 114, 19.5, -33.1
Proper motion: 0.255 arcsec/yr (192.0° from north)
Radial Velocity: 45.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 48.1, -36.2, -20.7

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: K1
Luminosity Class: III
Apparent visual magnitude: +3.32
Absolute visual magnitude: +0.48
Visual luminosity: 55.9 x Sol
Color indices: B-V= +1.19, U-B= +1.15
Diameter: 19.0 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 7.48 A.U.s
Angular size of star in sky in CZ: 1.358068 degrees

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