Common · Knowledge
HR 8799 e
Extrasolar planet
HR 8799 e is a large exoplanet, orbiting the star HR 8799, which lies 129 light-years from Earth. This gas giant has 7.5 times the mass of Jupiter and 1.13 times its radius. Due to their young age, all four discovered planets in the HR 8799 system are large, compared to all gas giants in the Solar System.
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HR 8799 e is the fourth planet orbiting HR 8799 in order of discovery. It is a young, hot and massive gas giant, lying just between the orbits of Saturn and Uranus in the Solar System. The planet is still glowing red-hot. HR 8799 e is the innermost known planet as it orbits closer to its star than the other three known planets in this planetary system. This planet orbits at semi-major axis of 16 AU and has an orbital period of 52.37 years. A team of researchers led by Christian Marois at the National Research Council's Herzberg Institute of Astrophysics identified the planet from data taken in 2009 and 2010 using the W.M. Keck Observatory in the K and L spectral bands. They announced their findings on 22 November 2010.
Text: Wikipédia, CC BY-SA 4.0. · Image: ESO/L. Calçada/SpaceEngine (CC BY 4.0) ·