Rossiter 4036

Catalog numbers:
Gliese (Gl) 750, Henry Draper (HD) 179930, Cape Photographic Durchmusterung (CPD) -46°9672, Hipparcos Input Catalog (HIC) 94739, Rossiter (RST) 4036, Smethells (Sm) 34
Arity: binary
Right Ascension and Declination: 19h16m42.53s, -45°53'14.7" (epoch 2000.0)
Distance from Sol: 51.4 light-years (15.8 parsecs)
Standard error in distance: 3.2932%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 11.8, -33.8, -36.9
Galactic (X,Y,Z) coordinates in ly: 46.6, -6.47, -20.8
Proper motion: 0.45 arcsec/yr (154.0° from north)
Radial Velocity: -36.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -45.7, -19.1, -5.45

What do all these fields mean?

Data for A and B's orbit around one other:
Combined spectrum: K9 V
Combined absolute visual magnitude: +8.37
Combined visual luminosity: 0.039 x Sol
Period: 7.61 years
Semimajor Axis: 3.69 A.U.s
Eccentricity: 0.31
Periastron distance: 2.55 A.U.s
Apastron distance: 4.83 A.U.s
Year in which periastron occurs: 1979.72
Source for orbit data: W.D. Heintz
As seen from A:
     At periastron, B would appear as magnitude -20.43
     At apastron, B would appear as magnitude -19.04
As seen from B:
     At periastron, A would appear as magnitude -20.41
     At apastron, A would appear as magnitude -19.02

Component A:
Apparent visual magnitude: +10.12
Absolute visual magnitude: +9.13
Visual luminosity: 0.019 x Sol
Diameter: 0.6 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.14 A.U.s
Angular size of star in sky in CZ: 2.297765 degrees

Component B:
Apparent visual magnitude: +10.10
Absolute visual magnitude: +9.11
Visual luminosity: 0.020 x Sol
Diameter: 0.58 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.14 A.U.s
Angular size of star in sky in CZ: 2.200808 degrees

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