Rho1 Cephei
star in the constellation Cepheus
Rho1 Cephei is a double star located in the northern constellation of Cepheus. Its name is a Bayer designation that is Latinized from ρ1 Cephei, and abbreviated Rho1 Cep or ρ1 Cep. As of 2014, the pair had an angular separation of 0.29 arc seconds along a position angle of 211.1°. This corresponds to a projected separation of 18.1 AU. Rho1 Cephei is faintly visible to the naked eye with an apparent visual magnitude of 5.84, and it forms an optical pair with the brighter star Rho2 Cephei. Based upon an annual parallax shift of 16.26 mas as seen from the Earth, Rho1 Cephei is located approximately 201 light-years (62 pc) from the Sun.
The primary component is a chemically peculiar Am star with a stellar classification of A2m. It has twice the mass of the Sun and is around 320 million years old. The smaller companion may be the source of the X-ray emission from this location, as stars similar to the primary component do not generally produce detectable levels of X-rays.
“Rho1 Cephei” enters the record as star in the constellation Cepheus. Crown Archives preserves that source wording while asking what Rho1, Cephei and star can confirm, complicate or overturn.
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This entry incorporates text from “Rho1 Cephei” 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.