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English: A rare family of six exoplanets has been unlocked with the help of ESA’s Cheops mission. The planets in this family are all smaller than Neptune and revolve around their star HD110067 in a very precise waltz. When the closest planet to the star makes three full revolutions around it, the second one makes exactly two during the same time. This is called a 3:2 resonance. The six planets form a resonant chain in pairs of 3:2, 3:2, 3:2, 4:3, and 4:3, resulting in the closest planet completing six orbits while the outer-most planet does one. Cheops confirmed the orbital period of the third planet in the system, which was the key to unlocking the rhythm of the entire system. This is the second planetary system in orbital resonance that Cheops has helped to reveal. The first one is called TOI-178.
Deutsch: Seltenes System von 6 Exoplaneten, entschlüsselt mit Hilfe von Cheops, Kameramission von ESA. Alle diese Planeten sind kleiner als Neptun and laufen um ihren Stern HD110067 in einem sehr präzisen "Walzer". Während der dem Stern nächste Planet 3 Umläufe macht, macht der nächste Planet genau 2. Das wird 3:2 Resonanz genannt. Die 6 Planeten bilden eine resonierende Kette mit den paarweisen Umlaufszahlverhältnissen 3:2, 3:2, 3:2, 4:3 und 4:3. Im Endeffekt vollführt der innerste Planet 6 Orbits, während der äußerste genau einmal umläuft. Cheops bestätigte die Umlaufperiode des dritten Planeten, womit das gesamte System entschlüsselt wurde. Dieses ist das zweite Planetensystem in Orbitalresonanz, das Cheops zu enthüllen half. Das erste ist TOI-178.
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来源 https://www.esa.int/ESA_Multimedia/Images/2023/11/Cheops_unlocks_family_of_six_exoplanets_in_harmonic_rhythm (story); original upload from https://www.sci.news/astronomy/resonant-system-six-sub-neptune-exoplanets-hd-110067-12496.html
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Star HD 110067 and Planetary System - November 30, 2023

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