AU Microscopii

light-years
Proper names: AU Microscopii
Catalog numbers:
     Gliese (Gl) 803, Henry Draper (HD) 197481, Cordoba Durchmusterung (CD) -31°17815, Hipparcos Input Catalog (HIC) 102409, Smithsonian Astrophysical Observatory (SAO) 212402, Vyssotsky McCormick (McC) 824
Arity: singular
Right Ascension and Declination: 20h45m9.46s, -31°20'26.3" (epoch 2000.0)
Distance from Sol: 32.4 light-years (9.94 parsecs)
Standard error in distance: 1.3243%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 18.3, -20.8, -16.9
Galactic (X,Y,Z) coordinates in ly: 25.1, 5.82, -19.7
Proper motion: 0.441 arcsec/yr (142.1° from north)
Radial Velocity: -7.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -11.9, -16.4, -8.37

What do all these fields mean?


Spectral class: M0e
Luminosity Class: V
Apparent visual magnitude: +8.96 (increasing to +8.56)
Absolute visual magnitude: +8.97 (increasing to +8.57)
Visual luminosity: 0.022 x Sol (increasing to 0.032 x Sol)
Variable type: BY Draconis (rotating variable)
Color indices: B-V= +1.42, U-B= +0.95, R-I= +0.85
Diameter: 0.67 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.15 A.U.s
Angular size of star in sky in CZ: 2.396095 degrees

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