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]
| Discovery[1] | |
|---|---|
| Discovered by | Wittenmyer et al. |
| Discovery date | October 19, 2015 |
| Radial velocity | |
| Designations | |
| HIP 84056 b | |
| Orbital characteristics[2] | |
| 2.065+0.059 −0.062 AU | |
| Eccentricity | 0.079+0.06 −0.053 |
| 825.8+9.9 −8.8 d 2.261+0.027 −0.024 yr | |
| Inclination | 5.2°±1.1° or 174.8°±1.1° |
| 91°+21° −17° | |
| 2,455,368+192 −92 JD | |
| 157°+44° −50° | |
| Star | HD 155233 |
| Physical characteristics[2] | |
| Mass | 31.9+8.5 −5.3 MJ |
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]