Chi Aquarii
star in the constellation Aquarius
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, is 530 light-years (160 parsecs). It is visible to the naked eye with an apparent visual magnitude of about 5.
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. It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude. The identified pulsation periods are 32.3, 38.5, and 44.9 days.
This is an aging red giant star with a spectral classification of M3 III. 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.
The public source identifies “Chi Aquarii” as star in the constellation Aquarius. This brief keeps that definition visible, then builds a research path around Aquarii, star and constellation.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q2607750. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1928.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Chi Aquarii” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.