Struve 2398

light-years

Catalog numbers:
     Gliese (Gl) 725, Bonner Durchmusterung (BD) +591915, Aitken Double Star (ADS) 11632, Vyssotsky McCormick (McC) 184, Struve (STF) 2398, New Suspected Variable (NSV) 11288, Luyten Double Star (LDS) 1466
Arity: binary
Right Ascension and Declination: 18h42m46.41s, +59°37'51.6" (epoch 2000.0)
Distance from Sol: 11.64 light-years (3.568 parsecs)
Standard error in distance: 0.9086%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 1.092, -5.781, 10.04
Galactic (X,Y,Z) coordinates in ly: 0.117, 10.62, 4.763
Proper motion: 2.273 arcsec/yr (323.3° from north)
Radial Velocity: -0.8 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -24.78, -12.53, 26.59

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +10.74
Combined visual luminosity: 0.00440 x Sol
Period: 453 years
Semimajor Axis: 55.87 A.U.s
Eccentricity: 0.53
Periastron distance: 26.26 A.U.s
Apastron distance: 85.49 A.U.s
Year in which periastron occurs: 1783
Source for orbit data: W.D. Heintz
As seen from A:
     At periastron, B would appear as magnitude -12.53
     At apastron, B would appear as magnitude -9.97
As seen from B:
     At periastron, A would appear as magnitude -13.30
     At apastron, A would appear as magnitude -10.74

Data for A and B's orbit, take 2:
Period: 346 years
Semimajor Axis: 42.10 A.U.s
Eccentricity: 0.55
Periastron distance: 18.95 A.U.s
Apastron distance: 65.26 A.U.s
Year in which periastron occurs: 2113
Source for orbit data: W. Rabe
As seen from A:
     At periastron, B would appear as magnitude -13.24
     At apastron, B would appear as magnitude -10.56
As seen from B:
     At periastron, A would appear as magnitude -14.01
     At apastron, A would appear as magnitude -11.32


Component A:
Catalog numbers:
     Henry Draper (HD) 173739, Giclas (G) 227-46, Luyten Half-Second (LHS) 58, Hipparcos Input Catalog (HIC) 91768, Smithsonian Astrophysical Observatory (SAO) 31128
Spectral class: M3
Luminosity Class: V
Apparent visual magnitude: +8.94
Absolute visual magnitude: +11.18
Visual luminosity: 0.00295 x Sol
Color indices: B-V= +1.52, U-B= +1.11, R-I= +1.06
Mass: 0.29 x Sol
Source for mass: Burnham's Celestial Handbook
Diameter: 0.541 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0543 A.U.s
Orbital period in CZ: 8.58045 days
Tidal index in CZ: 1812.01
Angular size of star in sky in CZ: 5.308896 degrees


Component B:
Catalog numbers:
     Henry Draper (HD) 173740, Giclas (G) 227-47, Luyten Half-Second (LHS) 59, Hipparcos Input Catalog (HIC) 91772, Smithsonian Astrophysical Observatory (SAO) 31129
Right Ascension and Declination: 18h42m47.19s, +59°37'37" (epoch 2000.0)
Celestial (X,Y,Z) coordinates in ly: 1.092, -5.782, 10.04
Galactic (X,Y,Z) coordinates in ly: 0.118, 10.62, 4.762
Proper motion: 2.272 arcsec/yr (323.1° from north)
Radial Velocity: 1.2 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: -24.64, -10.74, 27.48
Spectral class: M3.5
Luminosity Class: V
Apparent visual magnitude: +9.70
Absolute visual magnitude: +11.94
Visual luminosity: 0.00146 x Sol
Variable type: UV Ceti flare star (eruptive variable)
Color indices: B-V= +1.59, U-B= +1.14, R-I= +1.15
Mass: 0.25 x Sol
Source for mass: Burnham's Celestial Handbook
Diameter: 0.552 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.0382 A.U.s
Orbital period in CZ: 5.44788 days
Tidal index in CZ: 4494.95
Angular size of star in sky in CZ: 7.711789 degrees

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