83 Leonis Bb

83 Leonis Bb, also catalogued as HD 99492 b or abbreviated 83 Leo Bb, is an extrasolar planet with a minimum mass of 1.5 Neptune mass. It is located approximately 59 light-years away in the constellation of Leo (the Lion). The planet was discovered in January 2005 by the California and Carnegie Planet Search team, who use the Doppler spectroscopy method to detect planets.^[2] It orbits in a close orbit around the star, completing one orbit in about 17 days.^[1] The HARPS-N spectrograph discovered a second Neptune-like exoplanet in 2022 orbiting at 95 days.

83 Leonis Bb

Hypothetical view of 83 Leonis Bb rendered by Celestia
Discovery
Discovered by	Marcy, Butler, Vogt et al.
Discovery site	United States
Discovery date	25 January 2005
Detection method	Doppler spectroscopy
Orbital characteristics
Semi-major axis	0.12186 ± 0.00002 AU (18,230,000 ± 3,000 km)[1]
Eccentricity	0.13 ± 0.07[1]
Orbital period (sidereal)	17.054 ± 0.003[1] d
Time of periastron	2,450,449 ± 2[1]
Argument of periastron	196 ± 32[1]
Semi-amplitude	7.9 ± 0.6[1]
Star	83 Leonis B

See also

• 16 Cygni Bb