Английская Википедия:Iota Boötis

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Iota Boötis (ι Boo, ι Boötis) is a member of a binary star system in the constellation Boötes, approximately 96 light-years from Earth. It has the traditional name Asellus Secundus Шаблон:IPAc-en (Latin for "second donkey colt") and the Flamsteed designation 21 Boötis. The companion is HD 234121, a K0 main sequence star.

Components

Файл:Iota Boötis and HD 234121.jpg

ι Boötis and its nearby companion HD 234121 (the faint component C is also visible to the south)

Файл:IotaBooLightCurve.png

A visual band light curve for Iota Boötis, adapted from Kiss (1995)

Iota Boötis has a companion at an angular distance of 38.6 arcseconds, easily separated with binoculars.

The primary component is a white A-type main-sequence dwarf with a mean apparent magnitude of +4.75. It is classified as a Delta Scuti-type variable star and its brightness varies from magnitude +4.73 to +4.78 with a stable period of 38 minutes.

The companion, HD 234121, is a magnitude 7.3 main-sequence star belonging to spectral class K0V. It is separated from ι Boo by Шаблон:Val. HD 234121 has a mass of Шаблон:Solar mass, a luminosity of Шаблон:Solar luminosity, a temperature of Шаблон:Val, and a radius of Шаблон:Solar radius.

The Washington Double Star Catalog lists a third component, a 14th-magnitude star at 90 arcseconds, but it is an unrelated background star.

Nomenclature

This star, along with the other Aselli (θ Boo and κ Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā‘), "the Whelps of the Hyenas".Шаблон:Fix

In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Celestial Spear, refers to an asterism consisting of ι Boötis, κ² Boötis and θ Boötis. Consequently, the Chinese name for ι Boötis itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en). Шаблон:Clear left

External links

• HR 5350
• CCDM J14162+5122
• Image Iota Boötis
• The Constellations and Named Stars