EV Lacertae

Proper names: EV Lacertae
Catalog numbers:
     Gliese (Gl) 873, Bonner Durchmusterung (BD) +434305, Giclas (G) 216-16, Luyten Half-Second (LHS) 3853, Hipparcos Input Catalog (HIC) 112460, Vyssotsky McCormick (McC) 852
Arity: an unseen companion is suspected
Right Ascension and Declination: 22h46m49.18s, +44°20'0.1" (epoch 2000.0)
Distance from Sol: 16.5 light-years (5.05 parsecs)
Standard error in distance: 1.0244%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 11.2, -3.70, 11.5
Galactic (X,Y,Z) coordinates in ly: -3.09, 15.7, -3.71
Proper motion: 0.901 arcsec/yr (238.7° from north)
Radial Velocity: -0.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 21.3, 3.36, -1.25

What do all these fields mean?

Spectral class: M3.5e
Luminosity Class: V
Apparent visual magnitude: +10.30 (increasing to +6.70)
Absolute visual magnitude: +11.78 (increasing to +8.18)
Visual luminosity: 0.0017 x Sol (increasing to 0.046 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.61, R-I= +1.19
Mass: 0.16 x Sol
Diameter: 0.38 x Sol
Comfort Zone (visual): 0.041 A.U.s
Orbital period in CZ: 7.58926 days
Tidal index in CZ: 2316.23
Angular size of star in sky in CZ: 4.937290 degrees

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