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. 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.
| Discovery | |
|---|---|
| Discovered by | Wittenmyer et al. |
| Discovery date | October 19, 2015 |
Detection method | Radial velocity |
| Designations | |
Alternative names | HIP 84056 b |
| Orbital characteristics | |
Semi-major axis | 2.065+0.059 −0.062 AU |
| Eccentricity | 0.079+0.06 −0.053 |
Orbital period (sidereal) | 825.8+9.9 −8.8 d 2.261+0.027 −0.024 yr |
| Inclination | 5.2°±1.1° or 174.8°±1.1° |
Longitude of ascending node | 91°+21° −17° |
| 2,455,368+192 −92 JD | |
| 157°+44° −50° | |
| Star | HD 155233 |
| Physical characteristics | |
| Mass | 31.9+8.5 −5.3 MJ |
HD 155233 b was discovered by Wittenmyer et al. in October 2015. The orbit and mass were refined in 2016, and again in 2023.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.