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Iota Carinae
Iota Carinae (ι Car, ι Carinae) is a star in the southern circumpolar constellation (circumpolar if viewed at any location from approximately 40° S to the South Pole) of Carina. With an apparent visual magnitude of 2.2,〔 it is one of the brighter stars in the night sky. It can be seen from the latitude of Alexandria or Mobile, Alabama and southward.〔 This star has the traditional name Aspidiske, which should not be confused with Asmidiske, the proper name of ξ Puppis. Due to precession of the Earth's axis of rotation, Iota Carinae will be the South Star around 8100 CE.
==Properties==
Based on parallax measurements, this star is located at a distance of about from the Earth. It has a stellar classification of A9 Ib,〔 with the luminosity class of 'Ib' indicating it has reached the stage of its evolution where it has expanded to become a lower luminosity supergiant star.
Iota Carinae has more than seven times the Sun's mass〔 and has expanded to roughly 43 times the Sun's radius.〔 It is radiating about 4,900 times the luminosity of the Sun.〔 However, this luminosity appears to vary, causing the star's apparent magnitude to range between 2.23–2.28.〔 This energy is being radiated into space from the star's outer envelope at an effective temperature of 7,500 K,〔 giving Iota Carinae the white hue typical of an A-type star.〔
In the next 7500 years, the south Celestial pole will pass close to this stars and Upsilon Carinae (8100 CE).〔http://myweb.tiscali.co.uk/moonkmft/Articles/Precession.html〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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