FK Aquarii

Proper names: FK Aquarii
Catalog numbers:
Gliese (Gl) 867, Henry Draper (HD) 214479, Bonner Durchmusterung (BD) -21°6267, Hipparcos Input Catalog (HIC) 111802, Smithsonian Astrophysical Observatory (SAO) 191294, Vyssotsky McCormick (McC) 336, J. Herschel (HJ) 3126
Arity: binary
Right Ascension and Declination: 22h38m45.61s, -20°37'14.3" (epoch 2000.0)
Distance from Sol: 28.2 light-years (8.64 parsecs)
Standard error in distance: 1.2798%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 24.7, -9.16, -9.93
Galactic (X,Y,Z) coordinates in ly: 11.1, 8.92, -24.3
Proper motion: 0.459 arcsec/yr (97.0° from north)
Radial Velocity: -8.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -18.3, -9.54, -1.80

What do all these fields mean?

Component A:
Spectral class: M2e
Luminosity Class: V
Apparent visual magnitude: +9.06
Absolute visual magnitude: +9.38
Visual luminosity: 0.015 x Sol
Variable type: UV Ceti flare star (eruptive variable)
Period of variability: 4 days
Color indices: B-V= +1.51, U-B= +1.09, R-I= +0.93
Diameter: 0.69 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.12 A.U.s
Angular size of star in sky in CZ: 2.964022 degrees

Component B:
Catalog numbers:
Luyten (L) 717-22
Spectral class: M4e
Luminosity Class: V
Apparent visual magnitude: +11.45
Absolute visual magnitude: +11.77
Visual luminosity: 0.0017 x Sol
Color indices: B-V= +1.60, U-B= +1.12, R-I= +1.20
Diameter: 0.355 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.041 A.U.s
Angular size of star in sky in CZ: 4.575979 degrees

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