HD 216770 b

HD 216770 b is an extrasolar planet orbiting the star HD 216770. It has a mass about two thirds that of Jupiter, largest planet in the Solar System. But unlike the gas giants in the Solar System, it orbits in a very eccentric orbit around the star. The mean distance from the star is slightly larger than Mercury's, and it completes one orbit around the star in every 118 days.^[1]

HD 216770 b

Discovery
Discovered by	Mayor et al.
Discovery site	California, USA
Discovery date	June 30, 2003
Detection method	Doppler spectroscopy
Orbital characteristics
Apastron	0.63 AU (94,000,000 km)
Periastron	0.29 AU (43,000,000 km)
Semi-major axis	0.46 AU (69,000,000 km)
Eccentricity	0.37 ± 0.06
Orbital period (sidereal)	118.45 ± 0.55 d 0.32429 y
Average orbital speed	42
Time of periastron	2,452,672 ± 3.5
Argument of periastron	281 ± 10
Semi-amplitude	30.9 ± 1.9
Star	HD 216770
Physical characteristics
Mass	>0.65 MJ

See also

• HD 10647 b
• HD 108874 b
• HD 111232 b
• HD 142415 b
• HD 169830 c
• HD 41004 Ab
• HD 65216 b