V1396 Cygni

light-years
Proper names: V1396 Cygni
Catalog numbers:
     Gliese (Gl) 815, Catalogue Astrographique (AC) +3957322, Giclas (G) 210-48, Luyten Half-Second (LHS) 3609, Hipparcos Input Catalog (HIC) 103655, Vyssotsky McCormick (McC) 200, Kuiper (KUI) 103
Arity: binary
Right Ascension and Declination: 21h0m5.68s, +40°4'13.9" (epoch 2000.0)
Distance from Sol: 49.3 light-years (15.1 parsecs)
Standard error in distance: 3.6945%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 26.7, -26.6, 31.7
Galactic (X,Y,Z) coordinates in ly: 6.13, 48.7, -3.52
Proper motion: 0.668 arcsec/yr (114.6° from north)
Radial Velocity: -33.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -18.4, -34.9, -43.2

What do all these fields mean?

Data for A and B's orbit around one other:
Combined spectrum: M3e V
Combined absolute visual magnitude: +9.21
Combined visual luminosity: 0.018 x Sol
Period: 28.25 years
Semimajor Axis: 11.0 A.U.s
Eccentricity: 0.55
Periastron distance: 4.96 A.U.s
Apastron distance: 17.1 A.U.s
Year in which periastron occurs: 1948.2
Source for orbit data: S.L. Lippincott
As seen from A:
     At periastron, B would appear as magnitude -17.09
     At apastron, B would appear as magnitude -14.40
As seen from B:
     At periastron, A would appear as magnitude -18.65
     At apastron, A would appear as magnitude -15.96


Component A:
Apparent visual magnitude: +10.34
Absolute visual magnitude: +9.44
Visual luminosity: 0.015 x Sol
Variable type: UV Ceti flare star (eruptive variable)
Diameter: 0.55 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.12 A.U.s
Angular size of star in sky in CZ: 2.433038 degrees


Component B:
Apparent visual magnitude: +11.90
Absolute visual magnitude: +11.00
Visual luminosity: 0.0035 x Sol
Diameter: 0.36 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.059 A.U.s
Angular size of star in sky in CZ: 3.266661 degrees

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