description HD 128311 b Overview
HD 128311 b is a gas-giant exoplanet orbiting the K-type star HD 128311, about 53 light-years from Earth. It was detected through the radial-velocity technique used by the Anglo-Australian Planet Search and was reported in 2002. The planet is the inner member of a known multi-planet system. Its orbit is relatively close to the host star compared with the orbit of HD 128311 c.
help HD 128311 b FAQ
How was HD 128311 b discovered?
The Anglo-Australian Planet Search found HD 128311 b with the radial-velocity method, with the discovery reported in 2002. Unlike a transit planet, it was inferred from the motion of the K-type host star.
How long is HD 128311 b's orbit?
It takes about 453 days to orbit HD 128311, just over one Earth year. Its minimum mass is greater than about 562 Earth masses, or roughly 1.8 Jupiter masses.
Is HD 128311 b the inner planet?
Yes, b is the inner member of the known two-planet system, while HD 128311 c has a much longer orbit of about 922 days. The pair's periods are close to a 2:1 ratio, an important feature in discussions of their dynamics.
Does HD 128311 b transit its star?
It is a radial-velocity detection, not a standard transit discovery, so the catalog reports M sin i, a minimum mass. HD 128311 is a K-type star roughly 53 light-years away, which is why the system is often included in nearby-planet studies.
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