HD 74156

Approximately 3.0 L ☉

HD 74156 is a yellow dwarf is at least two companions, HD 74156 b and HD 74156 c, orbits. The star has the spectral type G0. Its mass is about 1.2 solar masses. His companions were discovered in 2001 by measurements of its radial velocity.

Possible existence of other exoplanets

In 2007, Barnes et al., predicted on the basis of model calculations, the existence of another exoplanet, HD 74156 d in this system. It was based on the assumption that all stable orbits would be filled in a system by a planet. As between the two first discovered companions a stable zone, this was yet another exoplanet suspected on such a path. Finally, the confirmation of this companion was claimed by measurements of the radial velocity of the central star. For exoplanets an orbital period of about 340 days and a minimum mass of 0.4 Jupiter masses was determined, the semi-major axis of the orbit was given as 1.0 astronomical units and the numerical eccentricity of 0.25. However, soon expressed various scientists cast significant doubt upon this discovery and a published study in 2009 by Wittenmyer et al. could not confirm the discovery. Thus, the existence of exoplanets described (but not a planet per se) must at the present time are regarded as highly doubtful. If the doubt should dispel this would be the first exoplanet, whose discovery was successfully predicted.