Bonner Durchmusterung +17°3729

light-years

Catalog numbers:
     Gliese (Gl) 728, Henry Draper Extension (HDE) 229590, Bonner Durchmusterung (BD) +17°3729, Giclas (G) 184-29, Luyten Half-Second (LHS) 3412, Hipparcos Input Catalog (HIC) 92311, Smithsonian Astrophysical Observatory (SAO) 104126, Vyssotsky McCormick (McC) 185
Arity: singular
Right Ascension and Declination: 18h48m51.862s, +17°26'19.91" (epoch 2000.0)
Distance from Sol: 55.7 light-years (17.1 parsecs)
Standard error in distance: 2.6578%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 11.2, -51.9, 16.7
Galactic (X,Y,Z) coordinates in ly: 36.5, 41.3, 7.71
Proper motion: 0.593 arcsec/yr (224.2° from north)
Radial Velocity: -21.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 18.9, -47.5, 11.6

What do all these fields mean?


Spectral class: M1.5
Luminosity Class: V
Apparent visual magnitude: +9.20
Absolute visual magnitude: +8.04
Visual luminosity: 0.053 x Sol
Color indices: B-V= +1.28, U-B= +1.22, R-I= +0.60
Diameter: 0.68 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.23 A.U.s
Angular size of star in sky in CZ: 1.573458 degrees

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