Bonner Durchmusterung +29°3872

Catalog numbers:
Gliese (Gl) 777, Henry Draper (HD) 190360, Bonner Durchmusterung (BD) +29°3872, Hipparcos Input Catalog (HIC) 98767, Smithsonian Astrophysical Observatory (SAO) 88133, Hoffleit Bright Star (HR) 7670, Woolley (Wo) 9683
Heavy element abundance: 182% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: trinary
Right Ascension and Declination: 20h3m37.416s, +29°53'48.35" (epoch 2000.0)
Distance from Sol: 51.84 light-years (15.89 parsecs)
Standard error in distance: 0.9758%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 23.08, -38.56, 25.84
Galactic (X,Y,Z) coordinates in ly: 19.61, 47.98, -0.871
Proper motion: 0.864 arcsec/yr (127.7° from north)
Radial Velocity: -45.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -12.56, -45.63, -64.07

What do all these fields mean?

Data for A and (Ba-Bb)'s orbit around one other:
Combined absolute visual magnitude: +4.70
Combined visual luminosity: 1.145 x Sol
Observed Separation: 2845 A.U.s
As seen from A:
(Ba-Bb) would appear as magnitude -1.27
As seen from (Ba-Bb):
A would appear as magnitude -9.60

Data for Ba and Bb's orbit around one other:
Combined absolute visual magnitude: +13.04
Combined visual luminosity: 0.000532 x Sol
Observed Separation: 69.93 A.U.s
Year of separation observation: 1971.2
Source for orbit data: Heintz AJ 96
As seen from Ba:
Bb would appear as magnitude -7.85
As seen from Bb:
Ba would appear as magnitude -8.98

Component A:
Catalog numbers:
Luyten Half-Second (LHS) 3510
Spectral class: G8
Luminosity Class: IV-V
Apparent visual magnitude: +5.71
Absolute visual magnitude: +4.70
Visual luminosity: 1.144 x Sol
Color indices: B-V= +0.73, U-B= +0.37, R-I= +0.27
Diameter: 1.264 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.070 A.U.s
Angular size of star in sky in CZ: 0.630019 degrees

Component Ba:
Catalog numbers:
Giclas (G) 125-55, Luyten Half-Second (LHS) 3509
Right Ascension and Declination: 20h1m23s, +29°43'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 22.74, -38.85, 25.71
Galactic (X,Y,Z) coordinates in ly: 19.94, 47.84, -0.581
Proper motion: 0.857 arcsec/yr (127.9° from north)
Radial Velocity: -5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 3.457, -7.644, -64.22
Spectral class: M4
Apparent visual magnitude: +14.37
Absolute visual magnitude: +13.36
Visual luminosity: 0.000393 x Sol
Color indices: B-V= +1.67, U-B= +1.12, R-I= +1.37
Diameter: 0.19 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0198 A.U.s
Angular size of star in sky in CZ: 5.110266 degrees

Component Bb:
Catalog numbers:
Giclas (G) 125-55, Luyten Half-Second (LHS) 3509
Right Ascension and Declination: 20h1m23s, +29°43'54" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 22.74, -38.85, 25.71
Galactic (X,Y,Z) coordinates in ly: 19.94, 47.84, -0.581
Apparent visual magnitude: +15.50
Absolute visual magnitude: +14.49
Visual luminosity: 0.000139 x Sol
Comfort Zone (visual): 0.0118 A.U.s

Data for this star system were most recently updated on 4-April-2001.