Gliese 832 b

Gliese 832 b (Gl 832 b or GJ 832 b) is a gas giant exoplanet about 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]

Gliese 832 b

Discovery[1]
Discovered by	Bailey et al.
Discovery site	Anglo-Australian Observatory
Discovery date	September 1, 2008
Detection method	Doppler spectroscopy
Orbital characteristics[2]
Semi-major axis	3.7±0.1 AU
Eccentricity	0.05±0.03
Orbital period (sidereal)	3853+51 −47 d 10.55+0.14 −0.13 yr
Inclination	51°±3° or 134°±3°
Longitude of ascending node	61°+17° −13° or 265°+12° −15°
Time of periastron	2456696+454 −338 JD
Argument of periastron	207°+22° −31°
Star	Gliese 832
Physical characteristics[2]
Mass	0.99+0.09 −0.08 MJ

Orbit

The planet takes 10.5 years to revolve around its star at an orbital distance of 3.7 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).

Discovery

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 orbital solution refined by subsequent studies in 2011,^[4] 2014,^[5] and 2022.^[6] The planet was detected astrometrically by two different 2023 studies, determining its inclination and revealing a true mass close to the mass of Jupiter.^[7][2]

See also

• Epsilon Eridani b
• Epsilon Indi Ab