K2-18 c


K2-18 c
Экзопланета
Элементы орбиты
Большая полуось (a) 0,06 ± 0,003 а.е.[1]
Эксцентриситет (e) 0,47[1]
Орбитальный период (P) 8,962 ± 0,008 сут[1][2]
Физические характеристики
Масса (m) 0,02363 ± 0,00418 MJ[3]
Минимальная масса (m sin i) 7,51 ± 1,33 M🜨[1]
Радиус(r) ? RJ
Информация об открытии
Дата открытия декабрь 2017[1]
Метод обнаружения метод Доплера[1][3]
Логотип Викиданных Информация в Викиданных ?

[4]K2-18 c - нептуновидная экзопланета в системе звезды K2-18

Масса планеты равна примерно 7.51 земным массам. Радиус планеты равен примерно 0.21 от радиуса юпитера. Орбитальный период составляет около 9 дней, расположена на расстоянии в 0,06 астрономических единиц от звезды. Была обнаружена в 2017 году методом Доплера.

Местоположение

Координаты K2-18 c Международной небесной системе отсчёта — прямое восхождение 11ч 30м 14.518с, склонение +07° 35′ 18.257″. Эта точка лежит в созвездии Льва, но за пределами его львиной фигуры. При первом обнаружении расстояние K2-18 от Земли оценивалось в 110 световых лет (34 пк). Однако более точные данные из Gaia (проекта звёздного картирования) показали, что K2-18 находится на расстоянии 124,02 ± 0,26 световых лет (38,025 ± 0,079 пк). Это улучшенное измерение расстояния помогло уточнить свойства экзопланетной системы.

Примечания

  1. ↑ 1 2 3 4 5 6 Cloutier R., Astudillo-Defru N., Doyon R., Bonfils X., J.-M. Almenara, Benneke B., Bouchy F., Delfosse X., Ehrenreich D., Forveille T. et al. Characterization of the K2-18 multi-planetary system with HARPS. A habitable zone super-Earth and discovery of a second, warm super-Earth on a non-coplanar orbit (англ.) // Astronomy and Astrophysics / T. Forveille — EDP Sciences, 2017. — Vol. 608. — P. 35–35. — ISSN 0004-6361; 0365-0138; 1432-0746; 1286-4846 — doi:10.1051/0004-6361/201731558 — arXiv:1707.04292
  2. ↑ Gomes G. O., Ferraz-Mello S. Tidal evolution of exoplanetary systems hosting potentially habitable exoplanets. The cases of LHS-1140 b-c and K2-18 b-c (англ.) // Monthly Notices of the Royal Astronomical Society / D. Flower — OUP, 2020. — Vol. 494, Iss. 4. — P. 5082—5090. — ISSN 0035-8711; 1365-2966 — doi:10.1093/MNRAS/STAA1110 — arXiv:2005.10318
  3. ↑ 1 2 Extrasolar Planets Encyclopaedia (англ.) — 1995.
  4. ↑ Exoplanet-catalog (англ.). Exoplanet Exploration: Planets Beyond our Solar System. Дата обращения: 21 марта 2024. Архивировано 1 июня 2023 года.

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