15 Sagittae

light-years
Proper names: 15 Sagittae
Catalog numbers:
     Gliese (Gl) 779, Henry Draper (HD) 190406, Bonner Durchmusterung (BD) +16°4121, Luyten Half-Second (LHS) 3515, Hipparcos Input Catalog (HIC) 98819, Smithsonian Astrophysical Observatory (SAO) 105635, Hoffleit Bright Star (HR) 7672, New Suspected Variable (NSV) 12757
Age: 5000 million years
Source for age: Don C. Barry, "Chromospheric Age Dependence of…", APJ 334
Arity: singular
Right Ascension and Declination: 20h4m6.22s, +17°4'13.1" (epoch 2000.0)
Distance from Sol: 57.6 light-years (17.7 parsecs)
Standard error in distance: 1.325%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 28.4, -47.2, 16.9
Galactic (X,Y,Z) coordinates in ly: 31.1, 47.8, -7.96
Proper motion: 0.571 arcsec/yr (224.3° from north)
Radial Velocity: 4.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 42.5, -20.3, 9.49

What do all these fields mean?


Spectral class: G1
Luminosity Class: V
Apparent visual magnitude: +5.79
Absolute visual magnitude: +4.55
Visual luminosity: 1.32 x Sol
Color indices: B-V= +0.61, U-B= +0.09, R-I= +0.19
Diameter: 1.12 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.15 A.U.s
Angular size of star in sky in CZ: 0.520681 degrees

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