Английская Википедия:Iota Cephei

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

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 Iota Cephei (ι Cephei, ι Cep) is a star in the northern constellation Cepheus. Based upon an annual parallax shift of Шаблон:Val as seen from the Earth,[1] it is located about Шаблон:Val from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 3.5.[2]

It is a K-type giant star with a stellar classification of K0 III.[3] It is currently at an evolutionary stage known as the red clump, indicating that it is generating energy through the fusion of helium at its core.[4] It has 11 times the Sun's radius and about 2.15 times the mass of the Sun. Its luminosity is 57 times that of the Sun, and its surface has an effective temperature of 4,768 K.[5]

Pole star

Iota Cephei is located within 5° of the precessional path traced across the celestial sphere by the Earth's North pole. In about 3,000 years, it will be one of the closest visible stars to the celestial north pole, along with Alfirk which will also be within 5° of the precessional path, on the other side.

Preceded by Pole Star Succeeded by
Errai 5200AD to 7500AD
with
Alfirk
Alderamin

References

Шаблон:Reflist

Шаблон:Sky

Шаблон:Stars of Cepheus

  1. Ошибка цитирования Неверный тег <ref>; для сносок vanLeeuwen2007 не указан текст
  2. Ошибка цитирования Неверный тег <ref>; для сносок Jennens1975 не указан текст
  3. Ошибка цитирования Неверный тег <ref>; для сносок Hekker2006 не указан текст
  4. Ошибка цитирования Неверный тег <ref>; для сносок Tautvaisiene2010 не указан текст
  5. Ошибка цитирования Неверный тег <ref>; для сносок Reffert2015 не указан текст