Ross 154

Proper names: V1216 Sagittarii
Catalog numbers:
     Gliese (Gl) 729, Ross 154, Luyten Half-Second (LHS) 3414, Hipparcos Input Catalog (HIC) 92403, Catalogue Astrographique (AC) -242833-183
Arity: singular
Right Ascension and Declination: 18h49m49.437s, -23°50'10.81" (epoch 2000.0)
Distance from Sol: 9.693 light-years (2.972 parsecs)
Standard error in distance: 0.538%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 1.912, -8.658, -3.917
Galactic (X,Y,Z) coordinates in ly: 9.321, 1.925, -1.831
Proper motion: 0.72 arcsec/yr (106.7° from north)
Radial Velocity: -12.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -13.80, -1.301, -7.564

What do all these fields mean?

Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +11.00 (increasing to +9.70)
Absolute visual magnitude: +13.63 (increasing to +12.33)
Visual luminosity: 0.000306 x Sol (increasing to 0.00101 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.72, U-B= +1.30, R-I= +1.30
Mass: 0.1 x Sol
Diameter: 0.2 x Sol
Comfort Zone (visual): 0.0175 A.U.s
Orbital period in CZ: 2.67314 days
Tidal index in CZ: 18669.7
Angular size of star in sky in CZ: 6.093868 degrees

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