description HD 82943 c Overview
HD 82943 c is a giant exoplanet orbiting the G-type star HD 82943, located about 89 light-years from Earth. It was discovered through radial-velocity observations and is in a 2:1 mean-motion resonance with the system's other known giant planet, HD 82943 b. This means the two planets complete their orbits in a stable timing relationship in which the inner planet circles the star about twice for every outer-planet orbit.
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What does the 2:1 resonance between HD 82943 c and HD 82943 b mean?
A 2:1 mean-motion resonance means the planets complete their orbits in an approximately two-to-one timing pattern. Their repeated gravitational alignment makes the system useful for studying planetary dynamics.
How was HD 82943 c detected?
HD 82943 c was detected through radial-velocity observations of the star HD 82943. The method measures the star's small movements caused by the gravitational pull of an orbiting planet.
How far away is HD 82943 c?
HD 82943 c belongs to the HD 82943 system, which is approximately 89 light-years from Earth. It orbits a G-type star rather than a red dwarf or giant star.
Is HD 82943 c a rocky planet?
No confirmed evidence identifies it as a rocky, Earth-like world. It is generally classified as a giant planet, so its bulk composition is expected to be dominated by hydrogen and helium.
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