91 Aquarii b

91 Aquarii b, also known as HD 219449 b, is an extrasolar planet orbiting in the 91 Aquarii system approximately 148 light-years away in the constellation of Aquarius. It orbits at the average distance of 105 Gm from its star, which is slightly closer than Venus is to the sun (108 Gm). The planet takes half an Earth year to orbit around the star in a very circular orbit with eccentricity less than 0.053.

91 Aquarii b

Artist's conception of planet orbiting ψ1 Aquarii
Discovery
Discovered by	Mitchell et al.
Discovery site	United States
Discovery date	16 November 2013
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.7 AU (100,000,000 km)
Eccentricity	0.027 ± 0.026
Orbital period (sidereal)	181.4 ± 0.1 d
Time of periastron	April 11, 2005 2453472.1 ± 24
Argument of periastron	177.3 ± 0.8
Semi-amplitude	91.0 ± 2.3
Star	91 Aquarii

See also

• HD 59686 b
• Iota Draconis b

References

• Mitchell, D.; Frink, S.; Quirrenbach, A.; Fischer, D.; Marcy, G.; Butler, P. (2003). "Four Substellar Companions Found Around Nearby K Giant Stars". Bulletin of the American Astronomical Society. 35: 1234. Bibcode:2003AAS...203.1703M.