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Asmidiske, Azmidiske, Xi Puppis, 7 Puppis

A multiple star in the northern parts of Puppis, lying within the band of the Milky Way in the same field of the sky as the open cluster M93. The name of this star derives from an accumulation of errors, and comes originally from the misapplication of the name Aspidiske (a name that actually belongs to Iota Carinae in neighbouring Carina). The confusion was compunded when the name was misspelt as Asmidiske or Azmidiske, from which the modern name Azmidi derives. (Formally, 'Azmidi' is the name of an individual star within the multiple system: the supergiant that forms the heart of the system.)

That supergiant is a yellow star some 120 times the diameter of the Sun, falling some 1,200 light years from the Solar System. It is a spectroscopic binary, with a small companion star in a close orbit, probably no more than about 2 AU from the primary star. About a thousand times farther from the supergiant, another companion orbits, a dwarf star that circles the primary at a distance of some 2,000 AU.


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