Ross 165

Catalog numbers:
Gliese (Gl) 766, Giclas (G) 185-37, Luyten Half-Second (LHS) 478, Hipparcos Input Catalog (HIC) 97237, Ross 165
Arity: binary
Right Ascension and Declination: 19h45m45.23s, +27°7'27.8" (epoch 2000.0)
Distance from Sol: 35.0 light-years (10.7 parsecs)
Standard error in distance: 5.6738%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: 13.9, -27.9, 16.0
Galactic (X,Y,Z) coordinates in ly: 15.7, 31.3, 0.57
Proper motion: 1.226 arcsec/yr (181.5° from north)
Source for proper motion: Gliese

What do all these fields mean?

Data for A and B's orbit around one other:
Combined spectrum: M4.5e V
Combined absolute visual magnitude: +12.22
Combined visual luminosity: 0.0011 x Sol
Period: 81 years
Semimajor Axis: 11.8 A.U.s
Source for orbit data: Heintz AJ 101, 1071
As seen from A:
B would appear as magnitude -12.96
As seen from B:
A would appear as magnitude -13.45

Component A:
Apparent visual magnitude: +12.91
Absolute visual magnitude: +12.75
Visual luminosity: 0.00069 x Sol
Diameter: 0.28 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.026 A.U.s
Angular size of star in sky in CZ: 5.688564 degrees

Component B:
Apparent visual magnitude: +13.40
Absolute visual magnitude: +13.24
Visual luminosity: 0.00044 x Sol
Diameter: 0.21 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.021 A.U.s
Angular size of star in sky in CZ: 5.346490 degrees

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