Английская Википедия:Gamma Librae
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
Gamma Librae (γ Librae, abbreviated Gamma Lib, γ Lib) is a suspected[1] binary star system in the constellation of Libra. It is visible to the naked eye, having an apparent visual magnitude of +3.91.[2] Based upon an annual parallax shift of 19.99 mas as seen from Earth, it lies 163 light years from the Sun.
The primary component (designated Gamma Librae A) has been formally named Zubenelhakrabi Шаблон:IPAc-en, the traditional name of the system.[3]
Nomenclature
γ Librae (Latinised to Gamma Librae) is the system's Bayer designation. The designations of the two components as Gamma Librae A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[4]
Gamma Librae bore the traditional name Zuben (el) Hakrabi (also rendered as Zuben-el-Akrab and corrupted as Zuben Hakraki). The name is a modification of the Arabic زبانى العقرب Zubān al-ʿAqrab "the claws of the scorpion", a name that dates to before Libra was a distinct constellation from Scorpius.Шаблон:Citation needed In 2016, the IAU organized a Working Group on Star Names (WGSN)[5] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[6] It approved the name Zubenelhakrabi for the component Gamma Librae A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[3]
In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Root, refers to an asterism consisting of Gamma Librae, Alpha2 Librae, Iota Librae and Beta Librae.[7] Consequently, the Chinese name for Gamma Librae itself is Шаблон:Lang (Шаблон:Lang), "the Third Star of Root".[8]
Properties
Because the star lies near the ecliptic it is subject to occultations by the Moon, allowing the angular size to be measured.[9] As of 1940, the pair had an angular separation of 0.10 arc seconds along a position angle of 191°.[10]
The yellow-hued primary, component Aa, is an evolved G-type giant star with a stellar classification of G8.5 III[11] and an estimated age of 4.3 billion years. It has 1.15 times the mass of the Sun and has expanded to 11.14 times the Sun's radius. The star is radiating around 72 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,786 K.[12] There is a magnitude 11.2 visual companion, component B, at an angular separation of 42.5 arc seconds along a position angle of 157°, as of 2013.[10]
At its distance, the visual magnitude is diminished by an extinction of 0.11 due to interstellar dust.[2] The system is moving closer to the Sun with a radial velocity of −26.71 km/s.[12]
Planetary system
On the 11th of April 2018 the discovery of two gas giant planets orbiting Gamma Librae was announced. [13]
Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:OrbitboxPlanet Шаблон:Orbitbox end
References
- ↑ Ошибка цитирования Неверный тег
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; для сносокEggleton2008
не указан текст - ↑ 2,0 2,1 Ошибка цитирования Неверный тег
<ref>
; для сносокpasj60_4_781
не указан текст - ↑ 3,0 3,1 Шаблон:Cite web
- ↑ Шаблон:Cite arXiv
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Шаблон:ISBN.
- ↑ Шаблон:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Шаблон:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокWhite1987
не указан текст - ↑ 10,0 10,1 Ошибка цитирования Неверный тег
<ref>
; для сносокWDSC2014
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокperkins1989
не указан текст - ↑ 12,0 12,1 Ошибка цитирования Неверный тег
<ref>
; для сносокJofre2015
не указан текст - ↑ "Planets around the evolved stars 24 Booties and γ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR". Takuya Takarada, Bun'ei Sato, Masashi Omiya, Hiroki Harakawa, Makiko Nagasawa, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida (April 11, 2018).
- Английская Википедия
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- Flamsteed objects
- Bayer objects
- Hipparcos objects
- G-type giants
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- Durchmusterung objects
- Libra (constellation)
- Planetary systems with two confirmed planets
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