14 Herculis c

14 Herculis c or 14 Her c is an exoplanet approximately 58.4 light-years away in the constellation of Hercules. The planet was found orbiting the star 14 Herculis, with a mass that would make the planet a gas giant roughly the same size as Jupiter but much more massive. It was discovered on November 17, 2005 and published on November 2, 2006,^[1] although its existence was not confirmed until 2021.^[2]

14 Herculis c

Discovery[1][2]
Discovered by	Goździewski et al.; Rosenthal et al.
Discovery site	United States
Discovery date	17 November 2005 (candidate) 2 July 2021 (confirmed)
Detection method	Doppler spectroscopy
Designations
Alternative names	HD 145675 c
Orbital characteristics[3]
Semi-major axis	27.4+16 −7.9 AU[4]
Eccentricity	0.65±0.06
Orbital period (sidereal)	52160±1028 d 142.8±2.8 yr
Inclination	82°±14°
Longitude of ascending node	224°±9°
Time of periastron	2,451,779±33 JD
Argument of periastron	0°±1°
Semi-amplitude	50.8±0.4 m/s
Star	14 Herculis
Physical characteristics[3]
Mass	7.1+1.0 −0.6 MJ

According to a 2007 analysis, the existence of a second planet in the 14 Herculis system was "clearly" supported by the evidence, but the planet's parameters were not precisely known. It may be in a 4:1 resonance with the inner planet 14 Herculis b.^[5]

The inclination and true mass of 14 Herculis c were measured in 2021, using data from Gaia,^[4] and refined by further astrometric studies in 2022 and 2023.^[6][3] The inclination is 82°, corresponding to a true mass of 7.1 M_J.^[3]

Direct imaging of 14 Herculis c with the James Webb Space Telescope is planned.^[7]