Cordoba Observatory 228

light-years

Catalog numbers:
     Gliese (Gl) 737, Henry Draper (HD) 175224, Cape Photographic Durchmusterung (CPD) -56°9037, Hipparcos Input Catalog (HIC) 93069, Smithsonian Astrophysical Observatory (SAO) 245823, UGPMF 463, Cordoba Observatory (COO) 228, Smethells (Sm) 24
Arity: binary
Right Ascension and Declination: 18h57m30.6s, -55°59'29.7" (epoch 2000.0)
Distance from Sol: 41.2 light-years (12.6 parsecs)
Standard error in distance: 3.664%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 5.72, -22.3, -34.2
Galactic (X,Y,Z) coordinates in ly: 35.6, -12.6, -16.5
Proper motion: 0.412 arcsec/yr (186.2° from north)
Radial Velocity: -13.5 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -21.1, -18.4, 2.12

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +8.43
Combined visual luminosity: 0.037 x Sol
Observed Separation: 63.2 A.U.s
Year of separation observation: 1892
As seen from A:
     B would appear as magnitude -13.08
As seen from B:
     A would appear as magnitude -13.63

Data for A and B's orbit, take 2:
Observed Separation: 45.5 A.U.s
Year of separation observation: 1959
As seen from A:
     B would appear as magnitude -13.79
As seen from B:
     A would appear as magnitude -14.34


Component A:
Spectral class: K7
Luminosity Class: V
Apparent visual magnitude: +9.45
Absolute visual magnitude: +8.94
Visual luminosity: 0.023 x Sol
Diameter: 0.64 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.15 A.U.s
Angular size of star in sky in CZ: 2.246123 degrees


Component B:
Proper motion: 0.412 arcsec/yr (186.2° from north)
Radial Velocity: -15.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -23.1, -17.7, 3.04
Spectral class: K5
Luminosity Class: V
Apparent visual magnitude: +10.00
Absolute visual magnitude: +9.49
Visual luminosity: 0.014 x Sol
Color indices: R-I= +0.84
Diameter: 0.64 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: 2.893603 degrees

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