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Alderamin, star α constellation Cepheid, magnitude 2.6, spectral class A, 39 years distance light.
Its location is highly boreal and this means that the star is observed mainly from the northern hemisphere, where it has also circumpolar from most temperate regions; Southern Hemisphere its visibility is rather limited to the temperate regions to the tropics and lower. Its magnitude equal to +2.45 allows it to be easily escorted even from urban areas of moderate size. The best time for his observation in the evening sky falls in the months between the end of June and November; in the northern hemisphere it is visible even through the fall, thanks to the boreal declination of the star, while the southern hemisphere can be observed particularly during the late winter months of the Southern Hemisphere. This star is characterized by a rotation speed of initially high, approximately 125 times that of the Sun.
Normally, for stars of this mass, the force of gravity tends to separate the chemical elements lighter to heavier ones, concentrating the latter towards the core of the star, but in the case of Alderamin, the high speed of rotation appears to prevent the phenomenon. Even the electromagnetic activity appears unusually high for a star of this spectral type. Alderamin, in fact, emits roughly the same amount of x-rays of the sun. At present, the cause of these abnormalities has not yet been clarified. On the celestial sphere, the star is located close to the north celestial pole precession trajectory, with the result that, cyclically, Alderamin almost becomes a cynosure coming find less than 3 ° from the north celestial pole, two degrees in most of the North Star current.
Alderamin you will find in these coordinates around the year 7500. The name is a contraction of the phrase Alderamin الذراع اليمين Arabic meaning “right arm”.
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