Xi Draconis
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Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra) is a double or binary star in the northern circumpolar constellation of Draco. It has an apparent visual magnitude of 3.75.[2] Based upon parallax measurements, it is located at a distance of Script error: No such module "convert". from the Sun.[1] At this distance, the apparent magnitude is diminished by 0.03 from extinction caused by intervening gas and dust.[4]
The two components are designated Xi Draconis A (officially named Grumium Template:IPAc-en, a traditional name for the system)[9][10] and B.
Nomenclature
ξ Draconis (Latinised to Xi Draconis) is the system's Bayer designation. The designations of the two components as Xi Draconis 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).[11]
It bore the traditional names Grumium. This is a graphic corruption of the Latin Grunnum 'snout',[12] as Ptolemy had described this star as being on the jawbone of the dragon.[9] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[14] It approved the name Grumium for the component Xi Draconis A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[10]
This star was also known as Nodus I or Nodus Primus. Along with Beta Draconis (Rastaban), Gamma Draconis (Eltanin), Mu Draconis (Erakis) and Nu Draconis (Kuma), it was one of Al ʽAwāyd "the Mother Camels", which were later known as the Quinque Dromedarii.[15]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Flail, refers to an asterism consisting of Xi Draconis, Nu Draconis, Beta Draconis, Gamma Draconis and Iota Herculis.[16] Consequently, the Chinese name for Xi Draconis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[17]
Namesake
USS Grumium (AK-112) was a United States Navy Crater-class cargo ship named after the star.
Properties
Xi Draconis A is of spectral class K2-III. It is not known for certain if Xi Draconis A is on the red giant branch, fusing hydrogen into helium in a shell surrounding an inert helium core, or on the horizontal branch fusing helium into carbon.[18] The possible companion, Xi Draconis B, is a 16th-magnitude star 316 arcseconds away but, most likely, the pairing is just a line-of-sight coincidence.[18]
References
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- ↑ In medieval manuscripts, both 'nn' and 'mi' were written with four strokes, ıııı, and thus could be easily confused. (That is why we now dot our i's.) Indeed, both the correct and corrupted spellings would have looked rather like Grııııııııııı.
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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.
- ↑ a b Script error: No such module "citation/CS1".
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