Gliese 317 C

In 2007, a jovian planet (designated Gliese 317 b) was announced to orbit the star. The planet orbits about 95% the distance between Earth to the Sun. Despite of this, it takes about 1. 9 years, due to the lower mass of the central M dwarf. Astrometric measurements on Gliese 317 provided a significant update to the distance, putting the star at 15. 3 pc, which is 65% further out than previously assumed. Using mass-luminosity calibrations, the new distance implies the star is significantly more massive and so are the planet candidates. The same astrometric measurements allowed to constrain the orbital inclination and put an upper limit to the mass of Gliese 317 b (98% confidence level) of 2. 5 M_jup.