Struve 2173

light-years

Catalog numbers:
     Gliese (Gl) 678, Henry Draper (HD) 158614, Bonner Durchmusterung (BD) -0°3300, Hipparcos Input Catalog (HIC) 85667, Smithsonian Astrophysical Observatory (SAO) 141702, Aitken Double Star (ADS) 10598, Hoffleit Bright Star (HR) 6516, Struve (STF) 2173
Heavy element abundance: 105% of Sol
Source for heavy element abundance: Strobel [Fe/H] Determinations
Arity: binary
Right Ascension and Declination: 17h30m23.811s, -1°3'46.33" (epoch 2000.0)
Distance from Sol: 53.6 light-years (16.4 parsecs)
Standard error in distance: 2.2822%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -6.91, -53.2, -1.00
Galactic (X,Y,Z) coordinates in ly: 47.4, 19.8, 15.6
Proper motion: 0.213 arcsec/yr (214.3° from north)
Radial Velocity: -77.3 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -62.3, -44.0, -21.0

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +4.25
Combined visual luminosity: 1.74 x Sol
Period: 46.4 years
Semimajor Axis: 16.7 A.U.s
Eccentricity: 0.174
Periastron distance: 13.8 A.U.s
Apastron distance: 19.6 A.U.s
Year in which periastron occurs: 1962.46
Source for orbit data: R.H. Wilson
As seen from A:
     At periastron, B would appear as magnitude -20.75
     At apastron, B would appear as magnitude -19.99
As seen from B:
     At periastron, A would appear as magnitude -20.97
     At apastron, A would appear as magnitude -20.21


Component A:
NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Spectral class: G8
Luminosity Class: IV-V
Apparent visual magnitude: +5.98
Absolute visual magnitude: +4.90
Visual luminosity: 0.96 x Sol
Diameter: 1.48 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.98 A.U.s
Angular size of star in sky in CZ: 0.809847 degrees


Component B:
Proper motion: 0.213 arcsec/yr (214.3° from north)
Radial Velocity: -73.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -59.2, -42.7, -20.0
Spectral class: G8
Luminosity Class: IV-V
Apparent visual magnitude: +6.20
Absolute visual magnitude: +5.12
Visual luminosity: 0.78 x Sol
Comfort Zone (visual): 0.88 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.