Alpha Circini

light-years
Proper names: Alpha Circini
Catalog numbers:
     Gliese (Gl) 560, Henry Draper (HD) 128898, Cape Photographic Durchmusterung (CPD) -64°2977, Hipparcos Input Catalog (HIC) 71908, Smithsonian Astrophysical Observatory (SAO) 252853, Fifth Fundamental Catalogue (FK5) 539, Hoffleit Bright Star (HR) 5463
Arity: binary
Right Ascension and Declination: 14h42m30.408s, -64°58'30.51" (epoch 2000.0)
Distance from Sol: 53.50 light-years (16.40 parsecs)
Standard error in distance: 0.9423%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -17.17, -14.73, -48.47
Galactic (X,Y,Z) coordinates in ly: 37.45, -37.91, -4.631
Proper motion: 0.3 arcsec/yr (218.1° from north)
Radial Velocity: 7.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -10.41, -19.08, -11.12

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +2.11
Combined visual luminosity: 12.46 x Sol
Observed Separation: 257.5 A.U.s
As seen from A:
     B would appear as magnitude -12.12
As seen from B:
     A would appear as magnitude -17.40


Component A:
Spectral class: F0p
Luminosity Class: V
Apparent visual magnitude: +3.19
Absolute visual magnitude: +2.12
Visual luminosity: 12.37 x Sol
Color indices: B-V= +0.24, U-B= +0.11, R-I= +0.02
Diameter: 2.06 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 3.516 A.U.s
Angular size of star in sky in CZ: 0.312302 degrees


Component B:
Proper motion: 0.3 arcsec/yr (218.1° from north)
Radial Velocity: 7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -10.55, -18.94, -11.10
Spectral class: K5
Luminosity Class: V
Apparent visual magnitude: +8.47
Absolute visual magnitude: +7.40
Visual luminosity: 0.0959 x Sol
Color indices: B-V= +1.15, U-B= +1.24, R-I= +0.42
Diameter: 0.76 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.310 A.U.s
Angular size of star in sky in CZ: 1.308497 degrees

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