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SU Persei
Star in the constellation Perseus From Wikipedia, the free encyclopedia
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SU Persei is a red supergiant star located in the constellation of Perseus. It is located within the Double Cluster, 7,250+470
−420 light-years away.[10] It is a semiregular variable star[3] that ranges in brightness from magnitude 7.2 to 8.7,[3] which makes it too faint to be seen with the naked eye, but can be seen with binoculars or a telescope.

SU Persei was imaged by the CHARA array in 2015, 2016, 2019, 2020, and 2021.[11] Observations during 2015 and 2016 with CHARA show that the star has an angular diameter between 3.51 and 3.68 milliarcseconds. Considering its large distance from Earth, this results in a radius between 1,044 and 1,139 times that of the Sun, making it one of the largest stars known.[6]
SU Persei is losing mass at a rate of 1.62+0.72
−0.63×10−6 M☉ per year, via a stellar wind.[12]
In 1907, Henrietta Swan Leavitt discovered that the star's brightness varies by examining photographic plates.[13] It was given its variable star designation, SU Persei, in 1908.[14]
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