Kuiper 79

light-years

Catalog numbers:
     Gliese (Gl) 661, Henry Draper (HD) 155876, Bonner Durchmusterung (BD) +45°2505, Giclas (G) 203-51, Hipparcos Input Catalog (HIC) 84140, Vyssotsky McCormick (McC) 165, Kuiper (KUI) 79
Arity: binary
Right Ascension and Declination: 17h12m7.852s, +45°39'59.18" (epoch 2000.0)
Distance from Sol: 20.6 light-years (6.32 parsecs)
Standard error in distance: 2.0195%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -2.99, -14.1, 14.7
Galactic (X,Y,Z) coordinates in ly: 5.37, 15.9, 12.0
Proper motion: 1.582 arcsec/yr (171.3° from north)
Radial Velocity: -30 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 37.9, -32.0, -26.2

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +10.40
Combined visual luminosity: 0.0060 x Sol
Period: 12.98 years
Semimajor Axis: 4.49 A.U.s
Eccentricity: 0.73
Periastron distance: 1.21 A.U.s
Apastron distance: 7.77 A.U.s
Year in which periastron occurs: 1939.16
Source for orbit data: P. Baize
As seen from A:
     At periastron, B would appear as magnitude -19.76
     At apastron, B would appear as magnitude -15.73
As seen from B:
     At periastron, A would appear as magnitude -20.20
     At apastron, A would appear as magnitude -16.17


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 433
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +9.96
Absolute visual magnitude: +10.96
Visual luminosity: 0.0036 x Sol
Mass: 0.31 x Sol
Diameter: 0.40 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.060 A.U.s
Orbital period in CZ: 9.66346 days
Tidal index in CZ: 1428.62
Angular size of star in sky in CZ: 3.556600 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 434
Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +10.40
Absolute visual magnitude: +11.40
Visual luminosity: 0.0024 x Sol
Mass: 0.25 x Sol
Diameter: 0.41 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.049 A.U.s
Orbital period in CZ: 7.9403 days
Tidal index in CZ: 2115.96
Angular size of star in sky in CZ: 4.429335 degrees

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