Bonner Durchmusterung -9°3595

light-years

Catalog numbers:
     Gliese (Gl) 491, Henry Draper (HD) 112758, Bonner Durchmusterung (BD) -9°3595, Luyten Half-Second (LHS) 2656, Hipparcos Input Catalog (HIC) 63366, Smithsonian Astrophysical Observatory (SAO) 139081, Southern Reference System (SRS) 11339
Arity: binary
Right Ascension and Declination: 12h59m1.575s, -9°50'2.59" (epoch 2000.0)
Distance from Sol: 68.5 light-years (21.0 parsecs)
Standard error in distance: 1.7747%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -65.3, -17.2, -11.7
Galactic (X,Y,Z) coordinates in ly: 25.1, -33.1, 54.5
Proper motion: 0.851 arcsec/yr (283.5° from north)
Radial Velocity: 8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -73.7, -36.8, 21.5

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +5.94
Combined visual luminosity: 0.37 x Sol
Observed Separation: 31.5 A.U.s
Year of separation observation: 1945
As seen from A:
     B would appear as magnitude -13.19
As seen from B:
     A would appear as magnitude -18.13

Data for A and B's orbit, take 2:
Observed Separation: 33.6 A.U.s
Year of separation observation: 1960
As seen from A:
     B would appear as magnitude -13.05
As seen from B:
     A would appear as magnitude -17.99


Component A:
Spectral class: K0
Luminosity Class: V
Apparent visual magnitude: +7.56
Absolute visual magnitude: +5.95
Visual luminosity: 0.36 x Sol
Diameter: 0.8 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.60 A.U.s
Angular size of star in sky in CZ: 0.707173 degrees
Detected companions: 1
Companion b:
     Mass: 35 x Jupiter, minimum
     Period: 103.22 days
     Semimajor Axis: 0.35 A.U.s
     Eccentricity: 0.16
     Periastron distance: 0.294 A.U.s
     Apastron distance: 0.406 A.U.s
     Source for orbit data: Mayor, Queloz, Udry, Halbwachs


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +12.50
Absolute visual magnitude: +10.89
Visual luminosity: 0.0038 x Sol
Diameter: 0.37 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.062 A.U.s
Angular size of star in sky in CZ: 3.181895 degrees

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