Brisbane Observatory (Sandage & Veron) 13

light-years

Catalog numbers:
     Gliese (Gl) 666, Henry Draper (HD) 156274, Cordoba Durchmusterung (CD) -4611370, Hipparcos Input Catalog (HIC) 84720, Smithsonian Astrophysical Observatory (SAO) 227816, Hoffleit Bright Star (HR) 6416, Brisbane Observatory (Sandage & Veron) (BSO) 13
Heavy element abundance: 45% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 17h19m3.74s, -46°38'6.4" (epoch 2000.0)
Distance from Sol: 28.7 light-years (8.79 parsecs)
Standard error in distance: 1.1809%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -3.50, -19.4, -20.8
Galactic (X,Y,Z) coordinates in ly: 27.2, -8.51, -2.91
Proper motion: 1.053 arcsec/yr (80.5° from north)
Radial Velocity: 23 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 27.9, 23.2, -33.7

What do all these fields mean?


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 444
Spectral class: G8
Luminosity Class: V
Apparent visual magnitude: +5.53
Absolute visual magnitude: +5.81
Visual luminosity: 0.41 x Sol
Color indices: B-V= +0.77, U-B= +0.35, R-I= +0.28
Diameter: 0.58 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.64 A.U.s
Angular size of star in sky in CZ: 0.478038 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 445
Proper motion: 1.053 arcsec/yr (80.5° from north)
Radial Velocity: 25.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 29.9, 22.6, -34.0
Spectral class: M0
Luminosity Class: V
Apparent visual magnitude: +8.69
Absolute visual magnitude: +8.97
Visual luminosity: 0.022 x Sol
Color indices: B-V= +1.41, U-B= +0.89, R-I= +0.81
Comfort Zone (visual): 0.15 A.U.s

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