HD 50890
HD 50890 is an orange-hued star in the constellation of Monoceros. With an apparent magnitude of 6.017, it is faintly visible to the naked eye under dark skies. As such, it is listed in the Bright Star Catalogue as HR 2582. It is located at a distance of according to Gaia DR3 parallax measurements, and is receding away from the Solar System at a heliocentric radial velocity of 19.5 km/s.
This is an aging red giant whose spectral [energy distribution] best matches a spectral type of K1III, albeit previous studies gave it slightly differing types of G6III or K2III. It is about 5.6 times as massive as the Sun; these massive stars quickly pass through their final stages of evolution, thus only a few of them can be observed as red giants, making HD 50890 a rare such instance. The star has expanded to a radius of and radiates 518 times the luminosity of the Sun from its inflated photosphere at an effective temperature of. It rotates at a projected velocity of km/s, unusually fast for a giant star. It has an age estimate of, at which several evolutionary stages are possible: it could be burning hydrogen in a shell around the core, which would imply an age of ~157 Myr; alternatively, it may be fusing helium at its core, placing the age at ~163 or ~180 Myr. The star exhibits solar-like oscillations at a frequency between 10 and 20 μHz.