Bonner Durchmusterung +6°398

light-years

Catalog numbers:
     Gliese (Gl) 105, Henry Draper (HD) 16160, Bonner Durchmusterung (BD) +6°398, Luyten Half-Second (LHS) 15, Hipparcos Input Catalog (HIC) 12114, Smithsonian Astrophysical Observatory (SAO) 110636, Fifth Fundamental Catalogue (FK5) 1073, Hoffleit Bright Star (HR) 753, Boss General Catalogue (GC) 3121
Arity: binary
Points of interest:
     Very recently, Hubble Space Telescope observations have detected a low-mass companion to the A star.  The short semimajor axis listed does not seem reasonable in light of a 60 year orbital period, and is probably based on a dubious observation.

Right Ascension and Declination: 2h36m4.888s, +6°53'12.89" (epoch 2000.0)
Distance from Sol: 23.51 light-years (7.209 parsecs)
Standard error in distance: 0.7441%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 18.14, 14.70, 2.819
Galactic (X,Y,Z) coordinates in ly: -15.41, 4.415, -17.21
Proper motion: 2.322 arcsec/yr (51.0° from north)
Radial Velocity: 26 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -76.61, 0.490, 33.19

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.50
Combined visual luminosity: 0.219 x Sol
Period: 60 years
Semimajor Axis: 1.853 A.U.s
Eccentricity: 0.45
Periastron distance: 1.019 A.U.s
Apastron distance: 2.686 A.U.s
Year in which periastron occurs: 1937
Source for orbit data: G. Martin, P.A. Ianna
As seen from A:
     At periastron, B would appear as magnitude -19.16
     At apastron, B would appear as magnitude -17.06
As seen from B:
     At periastron, A would appear as magnitude -25.03
     At apastron, A would appear as magnitude -22.92


Component A:
Catalog numbers:
     Giclas (G) 73-70, Luyten Two-Tenth (LTT) 10858
Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +5.79
Absolute visual magnitude: +6.50
Visual luminosity: 0.218 x Sol
Color indices: B-V= +0.98, U-B= +0.80, R-I= +0.36
Mass: 0.79 x Sol
Source for mass: European Southern Observatory
Diameter: 0.725 x Sol
Source for diameter: European Southern Observatory
Comfort Zone (visual): 0.467 A.U.s
Orbital period in CZ: 131.294 days
Tidal index in CZ: 7.73916
Angular size of star in sky in CZ: 0.827209 degrees


Component B:
Catalog numbers:
     Giclas (G) 73-71, Luyten Half-Second (LHS) 16, Vyssotsky McCormick (McC) 396, Luyten Two-Tenth (LTT) 10859
Right Ascension and Declination: 2h33m31s, +6°38'0" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 18.31, 14.50, 2.716
Galactic (X,Y,Z) coordinates in ly: -15.20, 4.512, -17.37
Proper motion: 2.322 arcsec/yr (51.4° from north)
Radial Velocity: 25.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -76.83, 0.0659, 32.45
Spectral class: M3.5n
Luminosity Class: V
Apparent visual magnitude: +11.66
Absolute visual magnitude: +12.37
Visual luminosity: 0.000981 x Sol
Color indices: B-V= +1.60, U-B= +1.11, R-I= +1.25
Mass: 0.14 x Sol
Diameter: 0.28 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0313 A.U.s
Orbital period in CZ: 5.41012 days
Tidal index in CZ: 4557.93
Angular size of star in sky in CZ: 4.766382 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 26-April-2003.