Ross 439

light-years

Catalog numbers:
     Gliese (Gl) 347, Ross 439
Arity: binary
Right Ascension and Declination: 9h26m25s, -7°8'30" (epoch 1950.0)
Distance from Sol: 54.5 light-years (16.7 parsecs)
Standard error in distance: 7.2868%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -42.4, 33.6, -6.78
Galactic (X,Y,Z) coordinates in ly: -23.2, -41.1, 27.3
Proper motion: 0.692 arcsec/yr (193.8° from north)
Radial Velocity: 8.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 15.7, -42.0, -32.8

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +10.89
Combined visual luminosity: 0.0038 x Sol
Observed Separation: 753 A.U.s
As seen from A:
     B would appear as magnitude -3.31
As seen from B:
     A would appear as magnitude -6.23


Component A:
Catalog numbers:
     Giclas (G) 161-33, Luyten Half-Second (LHS) 2145
Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +12.08
Absolute visual magnitude: +10.96
Visual luminosity: 0.0036 x Sol
Color indices: B-V= +1.53, U-B= +1.11, R-I= +1.04
Diameter: 0.45 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.060 A.U.s
Angular size of star in sky in CZ: 4.006745 degrees


Component B:
Catalog numbers:
     Giclas (G) 161-34, Luyten Half-Second (LHS) 2146
Right Ascension and Declination: 9h26m28s, -7°8'30" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -42.4, 33.6, -6.78
Galactic (X,Y,Z) coordinates in ly: -23.2, -41.1, 27.4
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +15.00
Absolute visual magnitude: +13.88
Visual luminosity: 0.00024 x Sol
Color indices: B-V= +1.87, U-B= +1.25, R-I= +1.73
Comfort Zone (visual): 0.016 A.U.s

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