| Gliese 832 b | |
| Discoverer: | Bailey et al. |
| Discovery Site: | Anglo-Australian Observatory |
| Discovered: | September 1, 2008 |
| Apsis: | astron |
| Period: | |
| Inclination: | or |
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.[1]
The planet takes 9.88 years to revolve around its star at an orbital distance of 3.5 AU; at the time of discovery, this was the longest-period Jupiter-like planet known orbiting a red dwarf. 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. Gliese 832 b was confirmed and its parameters updated by subsequent studies in 2011, 2014, and 2022. In 2023, an astrometric detection of the planet was announced, determining its inclination and revealing a true mass 80% the mass of Jupiter.