S.W. Burnham 543

light-years

Catalog numbers:
     Gliese (Gl) 157, Henry Draper (HD) 24916, Bonner Durchmusterung (BD) -1°565, Hipparcos Input Catalog (HIC) 18512, Smithsonian Astrophysical Observatory (SAO) 130840, Aitken Double Star (ADS) 2894, UGPMF 71, S.W. Burnham (BU) 543
Arity: binary
Right Ascension and Declination: 3h57m28.7s, -1°9'34" (epoch 2000.0)
Distance from Sol: 51.4 light-years (15.8 parsecs)
Standard error in distance: 3.0576%
Source for distance: Hipparcos
Celestial (X,Y,Z) coordinates in ly: 26.2, 44.3, -1.04
Galactic (X,Y,Z) coordinates in ly: -39.9, -7.80, -31.5
Proper motion: 0.245 arcsec/yr (233.2° from north)
Radial Velocity: 5.7 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 6.73, 0.58, -18.0

What do all these fields mean?

Data for A and B's orbit around one other:
Combined absolute visual magnitude: +7.02
Combined visual luminosity: 0.14 x Sol
Period: 3200 years
Semimajor Axis: 175 A.U.s
Eccentricity: 0
Periastron distance: 175 A.U.s
Apastron distance: 175 A.U.s
Year in which periastron occurs: 1900
Source for orbit data: J. Dommanget
As seen from A:
     At periastron, B would appear as magnitude -9.74
     At apastron, B would appear as magnitude -9.74
As seen from B:
     At periastron, A would appear as magnitude -13.30
     At apastron, A would appear as magnitude -13.30


Component A:
Spectral class: K4
Luminosity Class: V
Apparent visual magnitude: +8.04
Absolute visual magnitude: +7.06
Visual luminosity: 0.13 x Sol
Color indices: B-V= +1.11, U-B= +1.03, R-I= +0.45
Diameter: 0.69 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.36 A.U.s
Angular size of star in sky in CZ: 1.015889 degrees


Component B:
NOTE: This star is actually a close-orbiting binary pair. The data below are for both sub-components of the pair combined.
Proper motion: 0.245 arcsec/yr (233.2° from north)
Radial Velocity: 14 km/sec
Source for proper motion and radial velocity: Gliese
Galactic (U,V,W) velocity components in km/s: 0.30, -0.67, -23.0
Spectral class: M3e
Luminosity Class: V
Apparent visual magnitude: +11.61
Absolute visual magnitude: +10.62
Visual luminosity: 0.0049 x Sol
Color indices: B-V= +1.47, U-B= +1.08, R-I= +1.02
Diameter: 0.37 x Sol
Source for diameter: Apparent Diameters and Absolute Radii of Stars (Fracassini+ 1988)
Comfort Zone (visual): 0.070 A.U.s
Angular size of star in sky in CZ: 2.813417 degrees

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