39 Leonis

light-years
Proper names: 39 Leonis
Catalog numbers:
     Gliese (Gl) 387, Henry Draper (HD) 89125, Bonner Durchmusterung (BD) +23°2207, Hipparcos Input Catalog (HIC) 50384, Smithsonian Astrophysical Observatory (SAO) 81270, Aitken Double Star (ADS) 7712, Hoffleit Bright Star (HR) 4039
Age: 6200 million years
Source for age: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Heavy element abundance: 35% of Sol
Source for heavy element abundance: B. Edvardsson et al., "Chemical Evolution of the Galactic Disc", A&AP 275
Arity: binary
Right Ascension and Declination: 10h17m14.534s, +23°6'22.06" (epoch 2000.0)
Distance from Sol: 74.1 light-years (22.7 parsecs)
Standard error in distance: 1.6756%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -61.4, 29.5, 29.1
Galactic (X,Y,Z) coordinates in ly: -35.7, -21.9, 61.1
Proper motion: 0.429 arcsec/yr (255.1° from north)
Radial Velocity: 37.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -50.7, -30.8, 4.78

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +4.03
Combined visual luminosity: 2.13 x Sol
Observed Separation: 168 A.U.s
Year of separation observation: 1958
As seen from A:
     B would appear as magnitude -10.83
As seen from B:
     A would appear as magnitude -16.41


Component A:
Spectral class: F8w
Luminosity Class: Vb
Apparent visual magnitude: +5.82
Absolute visual magnitude: +4.04
Visual luminosity: 2.11 x Sol
Color indices: B-V= +0.50, U-B= -0.05, R-I= +0.17
Mass: 1.03 x Sol
Diameter: 0.99 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.45 A.U.s
Orbital period in CZ: 1.7269 years
Tidal index in CZ: 0.335326
Angular size of star in sky in CZ: 0.363075 degrees


Component B:
Proper motion: 0.429 arcsec/yr (255.1° from north)
Radial Velocity: 38.4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -51.1, -31.1, 5.52
Spectral class: M1
Luminosity Class: V
Apparent visual magnitude: +11.40
Absolute visual magnitude: +9.62
Visual luminosity: 0.012 x Sol
Mass: 0.24 x Sol
Diameter: 0.66 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.11 A.U.s
Orbital period in CZ: 27.675 days
Tidal index in CZ: 174.183
Angular size of star in sky in CZ: 3.158884 degrees

light-years
but not more than light-years away
Data for this star system were most recently updated on 12-May-2001.