HD 155233 b is a confirmed
brown dwarf orbiting around the
K-type giant star HD 155233 every 826 days, some 244
light-year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...
s away.
[ It has a minimum mass of almost 3 times that of Jupiter, and so was initially thought to be a gas giant ]exoplanet
An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not recognized as such. The first confirmation of detection occurred in 1992. A different planet, init ...
similar to Jupiter. However, in 2023 the inclination and true mass of HD 155233 b were determined via astrometry
Astrometry is a branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. It provides the kinematics and physical origin of the Solar System and this galaxy, the Milky Way.
His ...
, showing it to be a brown dwarf about 32 times the mass of Jupiter in a nearly face-on orbit.[
HD 155233 b was discovered by Wittenmyer et al. in October 2015.][ and again in 2023.]
References
{{extrasolar-planet-stub
Astronomical objects discovered in 2015
Brown dwarfs
Ophiuchus