14 Herculis b

14 Herculis b is an extrasolar planet orbiting the main sequence star orbiting 14 Herculis. Due to its high mass is assumed that it is a gas planet. At the time of its discovery in 1998, he was the exoplanet with the greatest circulation time, but now more extrasolar planets have been detected with longer orbital periods. 2005 was discovered in the 14 Herculis system with 14 Herculis c, a second planet.

Discovery

The planet was by periodic frequency shifts of the central star ( radial velocity method ) detected indirectly with the ELODIE spectrograph, in southern France. The discovery was announced at the 4th "Proto Stars and Planets" meeting by the research group of Michel Mayor 1998.

Web properties

The planet orbits its star at a distance of approximately 2.77 astronomical units every 1773.4 days. Its orbit is almost 37% a high eccentricity.

Physical Properties

14 Herculis b has a minimum mass of about 1583 Earth masses and 4.98 Jupiter masses. The exact mass is due to the uncertain orbital inclination currently not sure fixable. Astrometric measurements of the Hipparcos satellite, according to which the orbital inclination is 155.3 ° ( which would have meant an actual weight of more than 11 Jupiter masses) were later disqualified as unreichend exactly. A re- determination by the Hubble Space Telescope is to be published in 2009.

Direct Observation

Because of its great distance from its star, and the short distance of 14 Hercules system to the sun he is a promising candidate for a direct observation.

Swell

• Wittenmyer, RA, Endl, M., Cochran, WD: Long - Period Objects in the Extrasolar Planetary Systems 47 Ursae Majoris and 14 Herculis. In: The Astrophysical Journal. 654, No. 1, 2007, pp. 625-632. doi: 10.1086/509110.