KK Andromedae
variable star in the constellation Andromeda
KK Andromedae, also known as HD 9531, is a variable star in the northern constellation of Andromeda. It has an apparent visual magnitude of 5.90, which places it near the lower limit of visibility to the naked eye even under good viewing conditions. An Alpha2 Canum Venaticorum variable, it varies in brightness by 0.012 magnitude every 0.66 days. Based upon an annual parallax shift of 7.5 mas as seen from Earth, it is located around 437 light years from the Sun. At that distance, the brightness of the star is diminished by an extinction of 0.26 magnitude due to interstellar dust.
Cowley et al. (1969) assigned this star a stellar classification of B9 IV, which would indicate it is a B-type star in the subgiant stage that has exhausted the hydrogen supply at its core and is expanding. It is a catalogued as an Ap star that displays an abnormal silicon abundance, but has been reported to actually be a helium-weak chemically peculiar star. The star has just over three times the mass of the Sun and about 2.7 times the Sun's radius. It is an estimated 225 million years old and is spinning rapidly with a projected rotational velocity of 163 km/s and a rotation period of 16 hours.
“KK Andromedae” enters the record as variable star in the constellation Andromeda. Crown Archives preserves that source wording while asking what Andromedae, variable and star can confirm, complicate or overturn.
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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 14, 2026. The linked authority identifier is Q2399609. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1969.
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This entry incorporates text from “KK Andromedae” 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.