Ross 47


Catalog numbers:
     Gliese (Gl) 213, Giclas (G) 102-22, Luyten Half-Second (LHS) 31, Hipparcos Input Catalog (HIC) 26857, Ross 47, Catalogue Astrographique (AC) +121800-213
Arity: singular
Right Ascension and Declination: 5h39m14s, +12°29'18" (epoch 1950.0)
Distance from Sol: 18.9 light-years (5.79 parsecs)
Standard error in distance: 2.196%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 1.67, 18.4, 4.08
Galactic (X,Y,Z) coordinates in ly: -18.1, -4.41, -3.03
Proper motion: 2.571 arcsec/yr (128.4° from north)
Radial Velocity: 105.6 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -89.6, -89.7, 7.68

What do all these fields mean?

Spectral class: M4n
Luminosity Class: V
Apparent visual magnitude: +11.56
Absolute visual magnitude: +12.75
Visual luminosity: 0.00069 x Sol
Color indices: B-V= +1.68, U-B= +1.20, R-I= +1.27
Mass: 0.35 x Sol
Diameter: 0.17 x Sol
Comfort Zone (visual): 0.026 A.U.s
Orbital period in CZ: 2.63186 days
Tidal index in CZ: 19260
Angular size of star in sky in CZ: 3.447167 degrees

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