Orbits of the Gliese 581 system (original) (raw)

Orbits of the Gliese 581 system Plot of the orbits of the Gliese 581 system. Orbit data taken from Mayor et al. (2009), arXiv:0906.2780v1 [astro-ph.EP] "The HARPS search for southern extra-solar planets XVIII. An Earth-mass planet in the GJ 581 planetary system" The configuration is given in Table 2. The eccentricities of the inner two planets (e and b) are fixed to zero. Planetary positions are given for JD 2453152, which is close to the first RV observation by Udry et al. (http://cdsarc.u-strasbg.fr/ftp/cats/J/A+A/469/L43/gl581.dat) The semimajor axes in the paper are given to only 1 significant figure for the inner three planets, so I have recalculated the semimajor axes from Kepler's Third Law using a stellar mass of 0.31 times solar. Gliese 581 Distance: 6.21 ± 0.10 parsecs Visual magnitude: 10.57 Mass: 0.31 ± 0.02 solar masses Effective temperature: 3480 ± 48 K Luminosity: 0.013 solar luminosities [Fe/H]: -0.22 Age: 4.3 Gyr Gliese 581 e Orbital period: 3.14942 ± 0.00045 days Semimajor axis: 0.02 AU Eccentricity: 0 (fixed) Argument of periastron: 0 (fixed) Time of periastron: 2454716.80 ± 0.01 JD Minimum mass: 1.94 Earth masses Gliese 581 b Orbital period: 5.36874 ± 0.00019 days Semimajor axis: 0.04 AU Eccentricity: 0 (fixed) Argument of periastron: 0 (fixed) Time of periastron: 2454712.62 ± 0.02 JD Minimum mass: 15.65 Earth masses Gliese 581 c Orbital period: 12.9292 ± 0.0047 days Semimajor axis: 0.07 AU Eccentricity: 0.17 ± 0.07 Argument of periastron: -110 ± 25 degrees Time of periastron: 2454599.42 ± 0.87 JD Minimum mass: 5.36 Earth masses Gliese 581 c Orbital period: 66.80 ± 0.14 days Semimajor axis: 0.22 AU Eccentricity: 0.38 ± 0.09 Argument of periastron: -33 ± 15 degrees Time of periastron: 2454603.0 ± 2.2 JD Minimum mass: 7.09 Earth masses e b c d JD 2453152.0 (26 May 2004CE, 12:00:00.0 UT) Each grid square 0.05 AU × 0.05 AU Planets and star not to scale