Orbits of the HD 69830 system (original) (raw)

Orbits of the HD 69830 system Plot of the orbits of the HD 69830 system, scale 1000 SVG units = 1 AU. Orbit data taken from Wright et al. (2009), The Astrophysical Journal 693 (2), 1084–1099 "Ten New and Updated Multiplanet Systems and a Survey of Exoplanetary Systems" The configuration is given in Table 1 and the orbits are taken to be coplanar. Planetary positions are given for the epoch BJD 2453400.0, which lies within the quoted times of periastron passage for the three planets. The orbits are taken to be astrocentric rather than barycentric. This is because the true masses of the planets are unknown, so it is not possible to compute the actual positions of the barycentres. Debris disc parameters taken from Lisse et al. (2008), The Astrophysical Journal 658 (1), 584–592 "On the Nature of the Dust in the Debris Disk around HD 69830" Debris disc Inner radius: 0.93 AU Outer radius: 1.16 AU HD 69830 Distance: 12.49 ± 0.05 parsecs Visual magnitude: 5.95 Mass: 0.86 ± 0.03 solar masses Effective temperature: 5385 ± 20 K Luminosity: 0.60 ± 0.03 solar luminosities [Fe/H]: -0.05 ± 0.02 Age: 4 – 10 Gyr HD 69830 b Orbital period: 8.6670 ± 0.0030 days Semimajor axis: 0.0789 ± 0.0046 AU Eccentricity: 0.100 ± 0.040 Argument of periastron: 340 ± 26 degrees Time of periastron: 2453496.80 ± 0.60 BJD Minimum mass: 0.0322 ± 0.0045 Jupiter masses HD 69830 c Orbital period: 31.560 ± 0.040 days Semimajor axis: 0.187 ± 0.011 AU Eccentricity: 0.130 ± 0.060 Argument of periastron: 221 ± 35 degrees Time of periastron: 2453469.6 ± 2.8 BJD Minimum mass: 0.0374 ± 0.0052 Jupiter masses HD 69830 d Orbital period: 197.0 ± 3.0 days Semimajor axis: 0.633 ± 0.037 AU Eccentricity: 0.070 ± 0.070 Argument of periastron: 224 ± 61 degrees Time of periastron: 2453358 ± 34 BJD Minimum mass: 0.0573 ± 0.0080 Jupiter masses b c d BJD 2453400.0 (29 Jan 2005CE, 11:51:57.0 UT) Each grid square 0.2 AU × 0.2 AU Planets and star not drawn to scale