Facts about Hadar
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Hadar's two component stars are so close together that if positioned at our solar system's center, they would orbit entirely within Mercury's path around the Sun.
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Mass calculations reveal Hadar's primary star weighs approximately 12.4 times more than our Sun, while its companion star contains about 10.3 solar masses.
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Approximately 17,000 times more luminous than our Sun, Hadar's combined stellar output makes it one of the most intrinsically bright star systems visible to the unaided eye from Earth.
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Hadar's two stars orbit so closely that they complete a full revolution around their common center every 10.3 days, making this binary system one of the tightest known stellar pairs among bright naked-eye stars.
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Beta Centauri, Hadar's traditional name, derives from its designation as the second-brightest star in the constellation Centaurus despite being intrinsically more luminous than its primary rival Rigil Kentaurus.
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Hadar's primary star possesses a surface temperature of approximately 21,000 Kelvin, making it roughly four times hotter than Earth's Sun.
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At magnitude 2.6, Hadar ranks as the eleventh brightest star visible from Earth despite residing 390 light-years away in the constellation Centaurus.
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The binary star system Hadar, located 390 light-years away, contains a blue giant and blue subgiant orbiting each other with a period of 10.3 days.