Struve 3121

light-years

Catalog numbers:
     Gliese (Gl) 340, Henry Draper (HD) 79969, Bonner Durchmusterung (BD) +29°1883, Luyten Half-Second (LHS) 2125, Hipparcos Input Catalog (HIC) 45617, Smithsonian Astrophysical Observatory (SAO) 80745, Aitken Double Star (ADS) 7284, Struve (STF) 3121
Arity: binary
Right Ascension and Declination: 9h17m53.457s, +28°33'37.53" (epoch 2000.0)
Distance from Sol: 57.2 light-years (17.5 parsecs)
Standard error in distance: 1.8579%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: -38.2, 32.6, 27.3
Galactic (X,Y,Z) coordinates in ly: -39.1, -13.2, 39.5
Proper motion: 0.516 arcsec/yr (174.0° from north)
Radial Velocity: -19.1 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 23.8, -37.0, -16.3

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +6.00
Combined visual luminosity: 0.35 x Sol
Period: 34.2 years
Semimajor Axis: 11.6 A.U.s
Eccentricity: 0.35
Periastron distance: 7.52 A.U.s
Apastron distance: 15.6 A.U.s
Year in which periastron occurs: 1878.3
Source for orbit data: W.H. van den Bos
As seen from A:
     At periastron, B would appear as magnitude -20.31
     At apastron, B would appear as magnitude -18.72
As seen from B:
     At periastron, A would appear as magnitude -20.55
     At apastron, A would appear as magnitude -18.96


Component A:
Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +7.86
Absolute visual magnitude: +6.64
Visual luminosity: 0.19 x Sol
Diameter: 0.78 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.44 A.U.s
Angular size of star in sky in CZ: 0.948823 degrees


Component B:
Spectral class: K3
Luminosity Class: V
Apparent visual magnitude: +8.10
Absolute visual magnitude: +6.88
Visual luminosity: 0.15 x Sol
Diameter: 0.78 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.39 A.U.s
Angular size of star in sky in CZ: 1.059711 degrees

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