J. Herschel 5173

light-years

Catalog numbers:
     Gliese (Gl) 783, Henry Draper (HD) 191408, Cordoba Durchmusterung (CD) -36°13940, Hipparcos Input Catalog (HIC) 99461, Smithsonian Astrophysical Observatory (SAO) 211885, Hoffleit Bright Star (HR) 7703, J. Herschel (HJ) 5173, Cape Photographic Durchmusterung (CPD) -36°9037
Heavy element abundance: 56% of Sol
Standard error in heavy element abundance: 52%
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 20h11m11.967s, -36°6'4.3" (epoch 2000.0)
Distance from Sol: 19.74 light-years (6.052 parsecs)
Standard error in distance: 0.5417%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 8.639, -13.41, -11.63
Galactic (X,Y,Z) coordinates in ly: 16.74, 1.636, -10.32
Proper motion: 1.633 arcsec/yr (163.8° from north)
Radial Velocity: -129.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -117.9, -52.71, 48.54

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.41
Combined visual luminosity: 0.238 x Sol
Observed Separation: 44.78 A.U.s
Year of separation observation: 1949
Source for orbit data: Burnham's Celestial Handbook
As seen from A:
     B would appear as magnitude -10.73
As seen from B:
     A would appear as magnitude -16.91


Component A:
Catalog numbers:
     Luyten Half-Second (LHS) 486
Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +5.32
Absolute visual magnitude: +6.41
Visual luminosity: 0.238 x Sol
Color indices: B-V= +0.87, U-B= +0.46, R-I= +0.34
Mass: 0.76 x Sol
Diameter: 1.210 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.487 A.U.s
Orbital period in CZ: 142.557 days
Tidal index in CZ: 6.56454
Angular size of star in sky in CZ: 1.323279 degrees


Component B:
Catalog numbers:
     Luyten Half-Second (LHS) 487
Spectral class: M3.5
Luminosity Class: V-VI
Apparent visual magnitude: +11.50
Absolute visual magnitude: +12.59
Visual luminosity: 0.000801 x Sol
Mass: 0.35 x Sol
Diameter: 0.28 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0283 A.U.s
Orbital period in CZ: 2.93948 days
Tidal index in CZ: 15439.8
Angular size of star in sky in CZ: 5.274321 degrees

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