description Mu Arae d Overview
Mu Arae d is a gas-giant exoplanet in the system of Mu Arae, a Sun-like star located roughly 50 light-years away. It was inferred from radial-velocity measurements and was included among the planets announced in the system's multi-planet interpretation around 2004. The planet is more massive than Earth and belongs to the outer portion of the system, where orbital periods are longer than those of the inner planets.
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How was Mu Arae d discovered?
Mu Arae d was identified from high-precision radial-velocity data collected with the HARPS spectrograph. The four-planet system interpretation was published in 2006 by Francesco Pepe and collaborators.
What is the orbital period of Mu Arae d?
Its orbital period is about 311 days, at a distance of roughly 0.92 AU from Mu Arae. The orbit was described as almost circular in the HARPS system analysis.
How massive is Mu Arae d?
The reported minimum mass is about 0.52 Jupiter masses, or roughly 166 Earth masses. That puts Mu Arae d in the gas-giant range, not the small Neptune-like range of Mu Arae c.
How does Mu Arae d fit into its system?
It is one of four known planets orbiting the Sun-like star Mu Arae, also cataloged as HD 160691. Its 311-day orbit lies outside the inner 9.64-day planet c, while planet b has a roughly 643-day orbit and planet e is much farther out.
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