HD_155233_b
HD 155233 b is a confirmed brown dwarf orbiting around the K-type giant star HD 155233 every 826 days, some 244 light-years away.[3] It has a minimum mass of almost 3 times that of Jupiter, and so was initially thought to be a gas giant exoplanet similar to Jupiter. However, in 2023 the inclination and true mass of HD 155233 b were determined via astrometry, showing it to be a brown dwarf about 32 times the mass of Jupiter in a nearly face-on orbit.[2][4]
HD 155233 b was discovered by Wittenmyer et al. in October 2015.[1] The orbit and mass were refined in 2016,[5] and again in 2023.[2]