HD 88218
star in the constellation Antlia
HD 88218 (HR 3992) is a binary star in the southern constellation Antlia. The system has a combined apparent magnitude of 6.14, making it faintly visible to the naked eye. HD 88218 is relatively close at a distance of 103 light years but is receding with a heliocentric radial velocity of 36.7 km/s.
The visible component has a stellar classification of G0 V, indicating the object's status as a solar analogue. As for the companion, it is probably a K-type star based on a mass of 0.62 M☉. The stars have an orbital period of 270 years (albeit with great uncertainty) a semi-major axis of 50 astronomical units and an eccentricity of 0.61.
Despite the class described above, the primary is starting to evolve off the main sequence at the age of 6.8 billion years, having a low surface gravity and a slightly enlarged radius of 1.66 R☉, with the addition of being chromospherically inactive. Nevertheless, it has 107% the mass of the Sun and radiates at 2.88 times the luminosity of the Sun from its photosphere at an effective temperature of 5,870 K, giving a yellow glow. HD 88218 A has an iron abundance 72% that of the Sun and spins leisurely with a projected rotational velocity of 3 km/s.
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This entry incorporates text from “HD 88218” 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.