Catalogue Astrographique +41°915-440

light-years

Catalog numbers:
     Gliese (Gl) 839, Giclas (G) 215-20, Luyten Half-Second (LHS) 3727, Hipparcos Input Catalog (HIC) 108092, Vyssotsky McCormick (McC) 72, Catalogue Astrographique (AC) +41°915-440
Arity: singular
Right Ascension and Declination: 21h53m59.018s, +41°46'44.42" (epoch 2000.0)
Distance from Sol: 75.7 light-years (23.2 parsecs)
Standard error in distance: 3.4738%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 48.1, -29.5, 50.5
Galactic (X,Y,Z) coordinates in ly: -1.88, 74.6, -13.0
Proper motion: 0.533 arcsec/yr (133.4° from north)
Radial Velocity: -48 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -6.78, -57.4, -49.0

What do all these fields mean?


Spectral class: M1
Luminosity Class: V
Apparent visual magnitude: +10.35
Absolute visual magnitude: +8.52
Visual luminosity: 0.034 x Sol
Color indices: B-V= +1.36, U-B= +1.20, R-I= +0.66
Diameter: 0.57 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.18 A.U.s
Angular size of star in sky in CZ: 1.650074 degrees

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