Luyten 901-10

light-years

Catalog numbers:
     Gliese (Gl) 452, Luyten Half-Second (LHS) 2470, Luyten (L) 901-10, Luyten Palomar (LP) 673-42
Arity: binary
Right Ascension and Declination: 11h50m43s, -7°5'18" (epoch 1950.0)
Distance from Sol: 39.7 light-years (12.2 parsecs)
Standard error in distance: 9.3716%
Source for distance: Gliese
Celestial (X,Y,Z) coordinates in ly: -39.3, 1.59, -4.90
Galactic (X,Y,Z) coordinates in ly: 3.62, -23.7, 31.6
Proper motion: 0.538 arcsec/yr (198.3° from north)
Radial Velocity: 26.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 7.93, -40.1, 2.50

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +11.44
Combined visual luminosity: 0.0023 x Sol
Observed Separation: 195 A.U.s
As seen from A:
     B would appear as magnitude -1.15
As seen from B:
     A would appear as magnitude -8.68


Component A:
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +11.87
Absolute visual magnitude: +11.44
Visual luminosity: 0.0023 x Sol
Color indices: B-V= +1.54, R-I= +1.04
Mass: 0.18 x Sol
Diameter: 0.37 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.048 A.U.s
Orbital period in CZ: 9.04792 days
Tidal index in CZ: 1629.61
Angular size of star in sky in CZ: 4.111083 degrees


Component B:
Right Ascension and Declination: 11h50m44s, -7°5'24" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: -39.3, 1.59, -4.90
Galactic (X,Y,Z) coordinates in ly: 3.62, -23.7, 31.6
Spectral class: F?
Luminosity Class: wd?
Apparent visual magnitude: +19.40
Absolute visual magnitude: +18.97
Visual luminosity: 0.0000022 x Sol
Comfort Zone (visual): 0.0015 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.