Rho Scorpii
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Rho Scorpii (ρ Scorpii, abbreviated Rho Sco, ρ Sco) is a double star in the constellation of Scorpius. It has an apparent visual magnitude of +3.87, which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is located approximately 472 light years from the Sun.[1] At that distance, the visual magnitude of the system is reduced by 0.07 due to extinction from interstellar dust.[2] It is a member of the Upper Scorpius OB association.[3]
It has two components, designated Rho Scorpii A and B. Rho Scorpii A is itself a single-lined spectroscopic binary whose components are designated Rho Scorpii Aa (formally named Iklil Template:IPAc-en, traditionally the name for several neighboring stars)[4] and Ab.
Nomenclature
ρ Scorpii (Latinised to Rho Scorpii) is the system's Bayer designation. The designations of the three constituents as Rho Scorpii A and B, and those of A's components - Rho Scorpii Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[5]
Rho Scorpii was likely part of the Arabic lunar mansion of Iklil (الإكليل al-ʼiklīl) "the crown (of the forehead)"), along with Beta, Delta, Pi and possibly Nu Scorpii.
The corresponding asterism in Chinese astronomy, Template:Lang (Template:Lang), meaning Room, consists of Rho Scorpii, Pi Scorpii, Delta Scorpii, Beta¹ Scorpii and Beta² Scorpii.[6] Consequently, the Chinese name for ρ Scorpii itself is Template:Lang (Template:Lang), "the Second Star of Room".[7]
In 2016, the IAU organized a Working Group on Star Names (WGSN)[8] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[9] It approved the name Iklil for the component Rho Scorpii Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[4]
Properties
Rho Scorpii A displays the spectrum of blue-white B-type subgiant with a stellar classification of B2 IV.[10] It has an estimated mass nearly 8 times that of the Sun's and shines with 3,432 times the Sun's luminosity.[10] The two constituent stars orbit each other with a period of 4 days and an eccentricity of 0.27.[11]
Rho Scorpii B is a magnitude 12.80 visual companion that lies at an angular separation of 38.40 arcseconds along a position angle of 95°, as of the year 2000.[12]
Notes
References
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- ↑ Template: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, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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