V577 Monoceri

light-years
Proper names: V577 Monoceri
Catalog numbers:
     Gliese (Gl) 234, Giclas (G) 106-49, Hipparcos Input Catalog (HIC) 30920, Ross 614
Arity: binary
Points of interest:
     The A star, and most likely the B star also, is a flare star.

Right Ascension and Declination: 6h29m23.38s, -2°48'50.8" (epoch 2000.0)
Distance from Sol: 13.47 light-years (4.131 parsecs)
Standard error in distance: 0.6973%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -1.721, 13.35, -0.661
Galactic (X,Y,Z) coordinates in ly: -11.21, -7.351, -1.326
Proper motion: 0.997 arcsec/yr (134.8° from north)
Radial Velocity: 16.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -4.206, -24.97, 4.338

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +13.60
Combined visual luminosity: 0.000315 x Sol
Period: 16.6 years
Semimajor Axis: 3.850 A.U.s
Eccentricity: 0.38
Periastron distance: 2.387 A.U.s
Apastron distance: 5.313 A.U.s
Year in which periastron occurs: 1949.6
Source for orbit data: R.G. Probst
As seen from A:
     At periastron, B would appear as magnitude -13.16
     At apastron, B would appear as magnitude -11.43
As seen from B:
     At periastron, A would appear as magnitude -16.00
     At apastron, A would appear as magnitude -14.27


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 1849
Spectral class: M4.5e
Luminosity Class: V
Apparent visual magnitude: +11.76 (increasing to +10.96)
Absolute visual magnitude: +13.68 (increasing to +12.88)
Visual luminosity: 0.000294 x Sol (increasing to 0.000614 x Sol)
Variable type: UV Ceti flare star (eruptive variable)
Mass: 0.14 x Sol
Diameter: 0.719 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0171 A.U.s
Orbital period in CZ: 2.18979 days
Tidal index in CZ: 27821.2
Angular size of star in sky in CZ: 22.373027 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 1850
Spectral class: M7e
Luminosity Class: V
Apparent visual magnitude: +14.60
Absolute visual magnitude: +16.52
Visual luminosity: 0.0000215 x Sol
Mass: 0.08 x Sol
Diameter: 0.13 x Sol
Comfort Zone (visual): 0.00463 A.U.s
Orbital period in CZ: 9.77442 hours
Tidal index in CZ: 804306
Angular size of star in sky in CZ: 14.957927 degrees

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