Chi Eridani

light-years
Proper names: Chi Eridani
Catalog numbers:
     Gliese (Gl) 81, Henry Draper (HD) 11937, Cape Photographic Durchmusterung (CPD) -52°241, Luyten Half-Second (LHS) 1314, Hipparcos Input Catalog (HIC) 9007, Smithsonian Astrophysical Observatory (SAO) 232573, Fifth Fundamental Catalogue (FK5) 68, Hoffleit Bright Star (HR) 566, New Suspected Variable (NSV) 671
Arity: binary
Right Ascension and Declination: 1h55m57.488s, -51°36'31.99" (epoch 2000.0)
Distance from Sol: 57.0 light-years (17.5 parsecs)
Standard error in distance: 1.0725%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 31.0, 17.2, -44.7
Galactic (X,Y,Z) coordinates in ly: 4.55, -25.7, -50.7
Proper motion: 0.743 arcsec/yr (66.1° from north)
Radial Velocity: -6.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -58.6, -17.1, 10.5

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +2.48
Combined visual luminosity: 8.83 x Sol
Observed Separation: 87.4 A.U.s
Year of separation observation: 1947
As seen from A:
     B would appear as magnitude -12.38
As seen from B:
     A would appear as magnitude -19.38


Component A:
Spectral class: G5
Luminosity Class: IV
Apparent visual magnitude: +3.70
Absolute visual magnitude: +2.49
Visual luminosity: 8.82 x Sol
Color indices: B-V= +0.85, U-B= +0.45, R-I= +0.31
Diameter: 3.19 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 2.97 A.U.s
Angular size of star in sky in CZ: 0.573520 degrees


Component B:
Spectral class: M
Luminosity Class: V
Apparent visual magnitude: +10.70
Absolute visual magnitude: +9.49
Visual luminosity: 0.014 x Sol
Comfort Zone (visual): 0.12 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.