91 Aquarii b

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91 Aquarii b
Planet at Psi1 Aquarii.png
Artist's conception of planet orbiting Psi1 Aquarii
Discovered byMitchell et al.
Discovery site United States
Discovery date16 November 2003
Radial velocity
Orbital characteristics
0.7 AU (100,000,000 km)
Eccentricity0.027 ± 0.026
181.4 ± 0.1 d
April 11, 2005
2453472.1 ± 24
177.3 ± 0.8
Semi-amplitude91.0 ± 2.3

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.

See also[edit]


  • 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.

Coordinates: Sky map 23h 15m 53.5s, −09° 05′ 16″