Феркад

Феркад
Звезда
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Наблюдательные данные
(Эпоха J2000,0)
Прямое восхождение 15ч 20м 43,72с
Склонение +71° 50′ 2,46″
Расстояние 480 ± 30 св. лет (147 ± 10 пк)
Видимая звёздная величина (V) от +3.04 до +3.09
Созвездие Малая Медведица
Астрометрия
Лучевая скорость (Rv) −3,9 км/c
Собственное движение
 • прямое восхождение −18,03 mas в год
 • склонение +17,68 mas в год
Параллакс (π) 6.79 ± 0.46 mas
Абсолютная звёздная величина (V) от -2.80 до -2.75
Спектральные характеристики
Спектральный класс A3Iab:
Показатель цвета
 • B−V +0.05
 • U−B +0.12
Переменность DSCTC
Физические характеристики
Масса 8,3 M⊙
Радиус 15 R⊙
Температура 8600 K
Светимость 1100 L⊙
Вращение 180 км/с[1]
Коды в каталогах
Феркад, Феркад Майор, γ Ursae Minoris, 13 Ursae Minoris, HR 5735, BD+72°679, HD 137422, SAO 8220, HIP 75097, GC 20692.
γ UMi
Информация в базах данных
SIMBAD данные
Логотип Викиданных Информация в Викиданных ?

Феркад (γ UMi, γ Ursae Minoris, 13 UMi, гамма Малой Медведицы, Феркад Майор) — белый яркий гигант в созвездии Малой Медведицы. Происходит от арабского названия беты и гаммы Малой Медведицы ал-фаркадан (فرقد) — «два телёнка». Также называют Феркад Майор, чтобы не путать с 11 Малой Медведицы (Феркад Минор).

Входит в астеризм Малый Ковш. Вместе с Кохабом представляют собой астеризм Стражи Полюса[2].

Вследствие того, что звезда также является переменной типа Дельты Щита её звёздная величина меняется на 0.05m с периодом 3.43 часа[2].

Примечания

  1. ↑ Royer F., Grenier S., Baylac, M. -O., Gómez A. E., Zorec J. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i (англ.) // Astronomy and Astrophysics / T. Forveille — EDP Sciences, 2002. — Vol. 393, Iss. 3. — P. 897—911. — ISSN 0004-6361; 0365-0138; 1432-0746; 1286-4846 — doi:10.1051/0004-6361:20020943 — arXiv:astro-ph/0205255
  2. ↑ 1 2 Pherkad. (Stars, Jim Kaler)"  (англ.). Дата обращения: 3 августа 2009. Архивировано из оригинала 25 мая 2007 года.

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