Ross 780

Catalog numbers:
Gliese (Gl) 876, Bonner Durchmusterung (BD) -15°6290, Giclas (G) 156-57, Luyten Half-Second (LHS) 530, Hipparcos Input Catalog (HIC) 113020, Vyssotsky McCormick (McC) 337, Ross 780
Arity: singular
Right Ascension and Declination: 22h53m16.741s, -14°15'48.93" (epoch 2000.0)
Distance from Sol: 15.34 light-years (4.702 parsecs)
Standard error in distance: 0.9777%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 14.24, -4.266, -3.778
Galactic (X,Y,Z) coordinates in ly: 4.593, 6.123, -13.29
Proper motion: 1.143 arcsec/yr (123.5° from north)
Radial Velocity: -1.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -12.67, -18.99, -11.40

What do all these fields mean?

Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +10.16
Absolute visual magnitude: +11.80
Visual luminosity: 0.00166 x Sol
Color indices: B-V= +1.58, U-B= +1.15, R-I= +1.22
Mass: 0.23 x Sol
Diameter: 0.39 x Sol
Comfort Zone (visual): 0.0407 A.U.s
Orbital period in CZ: 6.25755 days
Tidal index in CZ: 3407
Angular size of star in sky in CZ: 5.106190 degrees
Detected companions: 2
Companion b:
     Mass: 1.89 x Jupiter, minimum
     Period: 61.02 days
     Semimajor Axis: 0.21 A.U.s
     Eccentricity: 0.27
     Periastron distance: 0.1533 A.U.s
     Apastron distance: 0.2667 A.U.s
     Source for orbit data: http://cfa-www.harvard.edu/planets/cat1.html
Companion c:
     Mass: 0.56 x Jupiter, minimum
     Period: 30.1 days
     Semimajor Axis: 0.13 A.U.s
     Eccentricity: 0.12
     Periastron distance: 0.1144 A.U.s
     Apastron distance: 0.1456 A.U.s
     Source for orbit data: http://cfa-www.harvard.edu/planets/cat1.html

Data for this star system were most recently updated on 26-April-2003.