Английская Википедия:HD 20003
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 20003 is a star in the southern constellation Hydrus. With an apparent visual magnitude of 8.39,[1] this yellow-hued star is much too faint to be visible to the naked eye. It is located at a distance of 136.6 light years from the Sun based on parallax. HD 20003 is drifting closer with a radial velocity of −16 km/s,[2] and is predicted to come to within Шаблон:Convert in around 1.4 million years from now.[1]
This object is an ordinary, G-type main-sequence star with a stellar classification of G8 V.[3] It is around five[4] billion years old with a magnetic activity cycle lasting about ten years[5] and a projected rotational velocity of 2.2 km/s.[4] The star has 94%[4] of the mass of the Sun and 92%[2] of the Sun's radius. The metallicity of this star is similar to the Sun, if slightly higher.[1] It is radiating 70.5% of the luminosity of the Sun from its photosphere at an effective temperature of 5,510 K.[2]
The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 18 astronomical units.[6]
Planetary system
HD 20003 has two planets that are at least 12 and 13.4 times as massive as the Earth and have orbital periods of just under 12 and 34 days, respectively. These were detected by the HARPS survey in 2011,[7] and the findings were confirmed using Spitzer in 2017.[5]
Since 2017, a third planet HD 20003 d on roughly half-year orbit is suspected.[8]
Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:OrbitboxPlanet Шаблон:Orbitbox end
References
- ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег
<ref>; для сносокAnderson2012не указан текст - ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег
<ref>; для сносокGaiaDR2не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокHouk1979не 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 сносокGillon2017не указан текст - ↑ Шаблон:Cite journal
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокMayor2011не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокUdry2017не указан текст
- Английская Википедия
- G-type main-sequence stars
- Planetary systems with two confirmed planets
- Hydrus
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- 2MASS objects
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях
