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SU Persei

Star in the constellation Perseus From Wikipedia, the free encyclopedia

SU Persei
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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.

Quick facts Constellation, Right ascension ...
Thumb
A light curve for SU Persei, plotted from ASAS-SN data[9]

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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