FL Virginis

light-years

Catalog numbers:
     Gliese (Gl) 473, Giclas (G) 12-43, Luyten Half-Second (LHS) 333, Wolf 424
Arity: binary
Right Ascension and Declination: 12h30m51s, +9°17'36" (epoch 1950.0)
Distance from Sol: 14.0 light-years (4.31 parsecs)
Standard error in distance: 1.8182%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -13.7, -1.86, 2.27
Galactic (X,Y,Z) coordinates in ly: 1.45, -4.24, 13.3
Proper motion: 1.811 arcsec/yr (277.4° from north)
Radial Velocity: -2 km/sec
Source for proper motion: Gliese
Source for radial velocity: Gliese '98
Galactic (U,V,W) velocity components in km/s: -34.0, -14.4, -2.99

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +14.24
Combined visual luminosity: 0.00018 x Sol
Period: 16.2 years
Semimajor Axis: 3.27 A.U.s
Eccentricity: 0.28
Periastron distance: 2.36 A.U.s
Apastron distance: 4.19 A.U.s
Year in which periastron occurs: 1961.6
Source for orbit data: W.D. Heintz
As seen from A:
     At periastron, B would appear as magnitude -14.58
     At apastron, B would appear as magnitude -13.33
As seen from B:
     At periastron, A would appear as magnitude -14.84
     At apastron, A would appear as magnitude -13.59


Component A:
Spectral class: M5.5e
Luminosity Class: V
Apparent visual magnitude: +13.04
Absolute visual magnitude: +14.87
Visual luminosity: 0.000098 x Sol
Mass: 0.072 x Sol
Diameter: 0.166 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0099 A.U.s
Orbital period in CZ: 1.34271 days
Tidal index in CZ: 73997.8
Angular size of star in sky in CZ: 8.930747 degrees


Component B:
Proper names: FL Virginis
Spectral class: M7
Luminosity Class: V
Apparent visual magnitude: +13.30
Absolute visual magnitude: +15.13
Visual luminosity: 0.000077 x Sol
Variable type: UV Ceti flare star (eruptive variable)
Mass: 0.067 x Sol
Diameter: 0.14 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0088 A.U.s
Orbital period in CZ: 1.16307 days
Tidal index in CZ: 98620.8
Angular size of star in sky in CZ: 8.490051 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 26-December-2002.