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Chi Aquarii
Star in the constellation Aquarius From Wikipedia, the free encyclopedia
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Chi Aquarii is a star in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from χ Aquarii, and abbreviated Chi Aqr or χ Aqr. The distance to this star, based upon parallax measurements with a 7% margin of error,[2] is 530 light-years (160 parsecs). It is visible to the naked eye with an apparent visual magnitude of about 5.[3]

The variability of the brightness of Chi Aquarii was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.[10] It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude.[11] The identified pulsation periods are 32.3, 38.5, and 44.9 days.[12]
This is an aging red giant star with a spectral classification of M3 III.[4] After the supply of hydrogen at its core was exhausted, it evolved off the main sequence, expanding to about 142 times the radius of the Sun.[7] The star is radiating 2,598 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,456 K.[7]
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