Английская Википедия:HD 221287
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
HD 221287, named Poerava, is a star in the southern constellation of Tucana. It has a yellow-white hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.82.[1] This object is located at a distance of 183 light years from the Sun, as determined from its parallax. It is drifting closer with a radial velocity of −22 km/s.[2]
This object is an F-type main-sequence star with a stellar classification of F7V.[3] It is relatively young with age estimates of 763[4] million and 1.3 billion years, and possesses an active chromosphere. Cool spots on the surface are generating a radial-velocity signal that is modulated by the rotation period of around five days.[5] The star is 18% larger and 20% more massive than the Sun.[4] It is radiating 1.9[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,440 K.[4]
Name
The star was given the designation "HD 221287" before being named Poerava by representatives of the Cook Islands in the IAU's 2019 NameExoWorlds contest, with the comment "Poerava is the word in the Cook Islands Maori language for a large mystical black pearl of utter beauty and perfection."[6]
Planetary system
On March 5, 2007, the astronomer Dominique Naef used the HARPS spectrograph to uncover the exoplanetary companion designated HD 221287 b (among others).[5] Using the amplitude from observations with HARPS, he calculated a minimum mass of 3.12 times that of Jupiter, making this a superjovian. This planet orbits 25% further from the star than Earth is from the Sun, with a low eccentricity.
Stability analysis reveals that the orbits of Earth–sized planets in HD 221287 b's Trojan points, located 60 degrees ahead and behind the planet in its orbit, would be stable for long periods of time.[7]
Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:Orbitbox end
See also
References
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокAnderson2012не указан текст - ↑ 2,0 2,1 Ошибка цитирования Неверный тег
<ref>; для сносокGaia DR2не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокhouk1978не указан текст - ↑ 4,0 4,1 4,2 Ошибка цитирования Неверный тег
<ref>; для сносокSoto2018не указан текст - ↑ 5,0 5,1 Ошибка цитирования Неверный тег
<ref>; для сносокNaef2007не указан текст - ↑ Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокSchwarz2007не указан текст
- Английская Википедия
- F-type main-sequence stars
- Planetary systems with one confirmed planet
- Tucana (constellation)
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Stars with proper names
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях
