EQ Pegasi

light-years
Proper names: EQ Pegasi
Catalog numbers:
     Gliese (Gl) 896, Bonner Durchmusterung (BD) +195116, Giclas (G) 68-24, Hipparcos Input Catalog (HIC) 116132, Vyssotsky McCormick (McC) 80, Wirtanen (WIR) 1
Arity: binary
Right Ascension and Declination: 23h31m52.24s, +19°56'15" (epoch 2000.0)
Distance from Sol: 20.4 light-years (6.25 parsecs)
Standard error in distance: 1.7253%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 19.0, -2.35, 6.95
Galactic (X,Y,Z) coordinates in ly: -2.59, 15.6, -12.9
Proper motion: 0.56 arcsec/yr (91.7° from north)
Radial Velocity: 1.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -14.4, -5.82, -5.91

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +11.24
Combined visual luminosity: 0.0028 x Sol
Period: 177.9 years
Semimajor Axis: 24.6 A.U.s
Eccentricity: 0.18
Periastron distance: 20.2 A.U.s
Apastron distance: 29.0 A.U.s
Year in which periastron occurs: 1914
Source for orbit data: J. Hopmann
As seen from A:
     At periastron, B would appear as magnitude -11.63
     At apastron, B would appear as magnitude -10.83
As seen from B:
     At periastron, A would appear as magnitude -13.65
     At apastron, A would appear as magnitude -12.85


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 3965
Spectral class: M3.5e
Luminosity Class: V
Apparent visual magnitude: +10.38 (increasing to +9.98)
Absolute visual magnitude: +11.40 (increasing to +11.00)
Visual luminosity: 0.0024 x Sol (increasing to 0.0035 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.54, U-B= +1.08, R-I= +1.13
Comfort Zone (visual): 0.049 A.U.s


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 3966
Proper motion: 0.56 arcsec/yr (91.7° from north)
Radial Velocity: -1.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -14.1, -7.58, -4.46
Spectral class: M4.5e
Luminosity Class: V
Apparent visual magnitude: +12.40
Absolute visual magnitude: +13.42
Visual luminosity: 0.00037 x Sol
Color indices: B-V= +1.65, U-B= +1.12, R-I= +1.62
Comfort Zone (visual): 0.019 A.U.s

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