Английская Википедия:11 Ursae Minoris

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11 Ursae Minoris is a single[1] star located approximately 410 light years away[2] in the northern circumpolar constellation of Ursa Minor. The star is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.15.[3] It is moving closer to the Earth with a heliocentric radial velocity of −17.5 km/s.[2]

This is an aging K-type giant star with a stellar classification of K4 III.[4] It is 1.2 billion years old with twice the mass of the Sun.[4] As a consequence of exhausting the hydrogen at its core, the star has expanded to 28 times the Sun's radius.[4] It is radiating 258 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,358 K.[4]

11 Ursae Minoris is sometimes named Pherkard or Pherkad Minor, the later name to distinguish it from Pherkad (Major) which is γ Ursae Minoris. It has also been designated as γ1 Ursae Minoris, in which case the brighter Pherkad is called γ2 Ursae Minoris, but these names are rarely used.[5] 11 Ursae Minoris is the Flamsteed designation.

11 Ursae Minoris has a detected planet discovered in August 2009.[6]

Planetary system

11 Ursae Minoris b was discovered during a radial velocity survey of 62 K type Red giant stars using the 2m Alfred Jensch telescope of the Thuringian State Observatory in Germany.[6]

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See also

References

Шаблон:Reflist

External links

Шаблон:Stars of Ursa Minor Шаблон:Sky

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  1. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Eggleton2008 не указан текст
  2. ↑ 2,0 2,1 Ошибка цитирования Неверный тег <ref>; для сносок GaiaDR2 не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Anderson2012 не указан текст
  4. ↑ 4,0 4,1 4,2 4,3 Ошибка цитирования Неверный тег <ref>; для сносок Baines2018 не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок xref не указан текст
  6. ↑ 6,0 6,1 Ошибка цитирования Неверный тег <ref>; для сносок Döllinger2009 не указан текст
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