HD 10180 c is an
exoplanet approximately 130
light-years away in the constellation
Hydrus
Hydrus is a small constellation in the deep southern sky. It was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm (14 in) d ...
.
It was discovered in 2010 using the
radial velocity method.
With a minimum mass comparable to that of
Neptune,
it is of the class of planets known as
Hot Neptune
A hot Neptune or Hoptune is a type of giant planet with a mass similar to that of Uranus or Neptune orbiting close to its star, normally within less than 1 AU. The first hot Neptune to be discovered with certainty was Gliese 436 b in 2007, an exo ...
s. Dynamical simulations suggest that if the mass gradient was any more than a factor of two, the system would not be stable.
While planet c does not exist in any
mean motion resonances, both planets with adjacent orbits (b and d) share
near resonances with c.
References
Exoplanets discovered in 2010
Exoplanets detected by radial velocity
Hydrus
Hot Neptunes
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