HD 117207 b

HD 117207 b is an exoplanet orbiting at 3.77 astronomical units around HD 117207, taking about 7.14 years to complete its orbit. Its orbit has a low to moderate eccentricity. This planet was announced in January 2005 by Marcy at the Keck Observatory.^[1] HD 117207 b has a minimum mass of 1.88 Jupiter masses,^[3] and in 2023 its inclination and true mass were determined via astrometry.^[2]

HD 117207 b

Discovery[1]
Discovered by	Marcy et al.
Discovery site	Keck Observatory
Discovery date	25 January 2005
Detection method	radial velocity
Orbital characteristics[2]
Semi-major axis	3.773+0.036 −0.035 AU
Eccentricity	0.04+0.026 −0.024
Orbital period (sidereal)	2606+12 −13 d 7.136+0.034 −0.035 yr
Average orbital speed	15.9
Inclination	76.6°+9.3° −12.0° or 103.4°+12.0° −9.3°
Longitude of ascending node	42°+17° −18°
Time of periastron	2456669+341 −339
Argument of periastron	186°+48° −47°
Semi-amplitude	26.6±0.93
Star	HD 117207
Physical characteristics[2]
Mass	2.106+0.16 −0.089 MJ