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However, the first person to study and note its varying brightness was Sir John Herschel, in 1836. The more formal name for Rigel is Beta Orionis, whereas Betelgeuse earned the scientific title of Alpha Orionis. It is 13" from σ Ori AB, corresponding to 4,680 AU. Betelgeuse is sometimes often known as Alpha Orionis.
The temperature of the star’s surface is estimated to be between 3,140 and 3,641 K. The estimated temperature of the star’s atmosphere is around 3,450 K. The gas around the star gradually cools as it expands away from the star. Being the brightest blue supergiant in the sky, its luminosity obscures one of its most interesting features—the other stars that compose this multiple star system. It has been named after its particular location in the Orion constellation. One of the sky's two first magnitude red supergiants (the other is Antares), Betelgeuse is among the larger stars on view to the naked eye, with a measured angular size of 0.05", corresponding to a radius of 2.9 AU at 425 light-years, so that if put in place of the Sun it would extend out as far as the asteroid belt.
Its name is of Arabic origin, meaning “the armpit of Orion”. Betelgeuse, Alpha Orionis (α Ori), is a red supergiant star of the spectral type M1-2 located in the constellation Orion, the Hunter. Betelgeuse – Alpha Orionis Constellation: Orion Since it is so bright in the night sky, many ancient cultures knew about Betelgeuse. It has an estimated radius about 887 to 955 times that of the Sun and is one of the largest stars that can be seen without binoculars. Its size, temperature, and brightness are very similar to σ Ori E but it shows none of the unusual spectral features or variability of that star.
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