Gamma Corvi (γ Corvi, abbreviated Gamma Crv, γ Crv) is a binary star and the brightest star in the southern constellation of Corvus, having an apparent visual magnitude of 2.59.
The system's two components are designated Gamma Corvi A (officially named Gienah , traditionally the name of the system)) and Gamma Corvi B, whose magnitude is 9.7 and which is 1.1 arcseconds away from Gamma Corvi A.
The distance to this system has been measured directly using the parallax technique, yielding an estimated  from the Sun.
Nomenclature
γ Corvi (Latinised to Gamma Corvi) is the system's Bayer designation.
The designation of the components – Gamma Corvi A and B – derives from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
Gamma Corvi bore the traditional name of Gienah derived from Arabic, from Ulugh Beg's الجناح الغراب  اليمن al-janāħ al-ghirāb al-yaman, meaning "the right wing of the crow", although on modern charts it marks the left wing.
The star Epsilon Cygni also bore this traditional name and Gamma Corvi was referred to as Gienah Corvi or Gienah Ghurab to distinguish it from this star in Cygnus.
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars.
The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.
It approved the name Gienah for  the component Gamma Corvi A on 6 November 2016 and Aljanah for Epsilon Cygni Aa on 30 June 2017.
They are both now so included in the List of IAU-approved Star Names.
Al-janāħ al-ghirāb al-yaman or Djenah al Ghyrab al Eymen appeared in the catalog of stars in the Calendarium of Al Achsasi Al Mouakket, which was translated into Latin as Dextra ala Corvi.
In Chinese,  (), meaning Chariot (asterism), refers to an asterism consisting of Gamma Corvi, Epsilon Corvi, Delta Corvi and Beta Corvi. 中國星座神話
, written by 陳久金.
Published by 台灣書房出版有限公司, 2005, .
Consequently, Gamma Corvi itself is known as  (, ). 香港太空館
– 研究資源 – 亮星中英對照表 , Hong Kong Space Museum.
Accessed on line November 23, 2010.
Properties
Gamma Corvi A is a giant star with a stellar classification of B8 III and has approximately 4.2 times the mass of the Sun.
It has a blue-white hue.
The spectrum of this star displays an anomalously higher than normal abundance of the elements mercury and manganese, making this a Mercury-manganese star.
However, there are other elements that show large over or under abundances.
This chemical peculiarity in an otherwise stable stellar atmosphere is most likely caused by separation of the elements through diffusion and gravitational settling.
It has a confirmed stellar companion with a mass of about 0.8 times the Sun's, which may be orbiting at a separation of around 50 AU over a 158-year period.
The photometry for Gamma Corvi B suggests a stellar classification in the range K5–M5 V. References
Corvi, Gamma Category:B-type giants Category:Corvus (constellation) Gienah Category:Binary stars Corvi, 04 059803 106625 4662 Category:Durchmusterung objects
