HD 149143

HD 149143, also called Rosalíadecastro, is a star with a close orbiting exoplanet in the Ophiuchus constellation. Its apparent visual magnitude is 7.89 (a binocular object) and the absolute magnitude is 3.87. The system is located at a distance of 239 light years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 12 km/s.

On December 17, 2019, as part of the IAU's NameExoWorlds project, the star HD 149143 was given the name Rosalíadecastro in honour of the Spanish poet Rosalía de Castro, who was a significant figure of Galician culture and prominent Spanish writer, whose work often referenced the night and celestial objects. The exoplanet companion was named Riosar in honour of the Sar River in Spain that was present in much of the literary work of the Spanish author Rosalía de Castro.

This is a slightly evolved star with a stellar classification of G0 that is overluminous for a high-metallicity G-type dwarf. It has 1.1 times the mass of the Sun and 1.3 times the Sun's radius. The star has an estimated age of around 7.6 billion years and is spinning with a projected rotational velocity of 3.9 km/s. It is radiating 2.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,213 K.

Planetary system
HD 149143 b, the planet that orbits HD 149143, was discovered by the N2K Consortium during their search for short-period gas giant planets around metal-rich stars. The planet was independently discovered by the Elodie metallicity-biased search for transiting Hot Jupiters.