A Caltech astronomer says extrasolar planet HR 5183 b has a highly elliptical orbit that is unlike that of any planet in our solar system or beyond. - NBCNewsMACH
Dubbed HR 5183 b, the exoplanet is at least three times as massive as Jupiter, and it takes a long, looping path around ain the constellation Virgo. If the exoplanet were in our own solar system — in which Earth and the other planets move around the sun in nearly circular orbits — its extremely elliptical orbit would take it from beyond Neptune to within the orbit of Jupiter .
She said other exoplanets with highly elliptical, or eccentric, orbits have been observed but HR 5183 b is the only one known to orbit its host star at such extreme distances. The astronomers didn't observe HR 5183 b directly but inferred its size and orbit by observing tiny"wobbles" in light from its host star caused by the changing gravitational pull of an orbiting planet . The data that led to the discovery came from observations made at the Lick Observatory in Hamilton, California; the Keck Observatory in Waimea on the Island of Hawaii; and the McDonald Observatory in Fort Davis, Texas.
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