Kappa Tucanae

light-years
Proper names: Kappa Tucanae
Catalog numbers:
     Gliese (Gl) 55.3, Henry Draper (HD) 7788, Cape Photographic Durchmusterung (CPD) -69°45, Hipparcos Input Catalog (HIC) 5896, Smithsonian Astrophysical Observatory (SAO) 248345, Hoffleit Bright Star (HR) 377, Woolley (Wo) 9049, New Suspected Variable (NSV) 454, J. Herschel (HJ) 3423
Arity: binary
Right Ascension and Declination: 1h15m46.1s, -68°52'33.3" (epoch 2000.0)
Distance from Sol: 66.6 light-years (20.4 parsecs)
Standard error in distance: 1.0714%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 22.7, 7.80, -62.2
Galactic (X,Y,Z) coordinates in ly: 21.7, -38.6, -49.8
Proper motion: 0.422 arcsec/yr (74.0° from north)
Radial Velocity: 4 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -35.9, -19.0, -6.32

What do all these fields mean?

Data for A and B's orbit around one other:
Combined spectrum: F6 IV
Combined absolute visual magnitude: +3.30
Combined visual luminosity: 4.15 x Sol
Period: 1222.4 years
Semimajor Axis: 156 A.U.s
Eccentricity: 0.45
Periastron distance: 85.9 A.U.s
Apastron distance: 226 A.U.s
Year in which periastron occurs: 1790.1
Source for orbit data: M. Scardia
As seen from A:
     At periastron, B would appear as magnitude -16.25
     At apastron, B would appear as magnitude -14.15
As seen from B:
     At periastron, A would appear as magnitude -18.46
     At apastron, A would appear as magnitude -16.36


Component A:
Proper names: Kappa(2) Tucanae
Apparent visual magnitude: +4.99
Absolute visual magnitude: +3.44
Visual luminosity: 3.67 x Sol
Diameter: 1.12 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 1.92 A.U.s
Angular size of star in sky in CZ: 0.311663 degrees


Component B:
Proper names: Kappa(1) Tucanae
Right Ascension and Declination: 1h14m4s, -69°8'24" (epoch 1950.0)
Celestial (X,Y,Z) coordinates in ly: 22.5, 7.54, -62.3
Galactic (X,Y,Z) coordinates in ly: 22.0, -38.7, -49.6
Proper motion: 0.416 arcsec/yr (73.4° from north)
Radial Velocity: 4.9 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -35.2, -18.8, -7.51
Spectral class: G5
Luminosity Class: V-VI
Apparent visual magnitude: +7.20
Absolute visual magnitude: +5.65
Visual luminosity: 0.48 x Sol
Comfort Zone (visual): 0.69 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.