Known celestial objects within 20 light-years
| |||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||
Italic are systems without known trigonometric parallax. | |||||||||||||||||||||||||||||||||||||||||||
Constellation of Grus
| Discovery[1] | |
|---|---|
| Discovered by | Bailey et al. |
| Discovery site | Anglo-Australian Observatory |
| Discovery date | September 1, 2008 |
| Doppler spectroscopy | |
| Orbital characteristics[2] | |
| 3.53+0.15 −0.16 AU | |
| Eccentricity | 0.069+0.026 −0.027 |
| 3609+124 −121 d 9.88+0.34 −0.33 yr | |
| Inclination | 54.9°+6.6° −4.9° or 125.1°+4.9° −6.6° |
| 41.0°+77.0° −23.0° | |
| 2457470+327 −294 | |
| 213.0°±33.0° | |
| Star | Gliese 832 |
| Physical characteristics[2] | |
| Mass | 0.8+0.12 −0.11 MJ |
Gliese 832 b (Gl 832 b or GJ 832 b) is a gas giant exoplanet about 80% the mass of Jupiter, located 16.2 light-years from the Sun in the constellation of Grus, orbiting the red dwarf star Gliese 832.[3]
The planet takes 9.88 years to revolve around its star at an orbital distance of 3.5 AU;[2] at the time of discovery, this was the longest-period Jupiter-like planet known orbiting a red dwarf.[1] The brightness of the faint parent star at that distance corresponds to the brightness of the Sun from 80 AU (or 100 times brighter than a full Moon as seen from Earth).
The planet was discovered at the Anglo-Australian Observatory on September 1, 2008. It would induce an astrometric perturbation on its star of at least 0.95 milliarcseconds and is thus a good candidate for being detected by astrometric observations. Despite its relatively large angular distance, direct imaging is problematic due to the star–planet contrast.[1] Gliese 832 b was confirmed and its parameters updated by subsequent studies in 2011,[4] 2014,[5] and 2022.[6] In 2023, an astrometric detection of the planet was announced, determining its inclination and revealing a true mass 80% the mass of Jupiter.[2]
