91 Aquarii b

91 Aquarii b

Exoplanet		List of exoplanets
Artist's conception of planet orbiting Psi1 Aquarii, with background visual binary.
Parent star
Star		91 Aquarii A
Constellation		Aquarius
Right ascension	(α)	23h 15m 53.5s
Declination	(δ)	−9° 05′ 16″
Apparent magnitude	(mV)	4.21
Distance		149.7 ± 2.0 ly (45.9 ± 0.6 pc)
Spectral type		K0III
Mass	(m)	1.4 ± 0.1 M☉
Radius	(r)	11.0 ± 0.1 R☉
Temperature	(T)	4665 ± 18 K
Metallicity	[Fe/H]	-0.03 ± 0.1
Age		3.56 ± 0.63 Gyr
Orbital elements
Semi-major axis	(a)	0.7 AU
Eccentricity	(e)	0.027 ± 0.026
Orbital period	(P)	181.4 ± 0.1 d
Argument of periastron	(ω)	177.3 ± 0.8°
Time of periastron	(T0)	April 11, 2005 2453472.1 ± 24 JD
Semi-amplitude	(K)	91.0 ± 2.3 m/s
Physical characteristics
Minimum mass	(m sin i)	3.2 MJ
Discovery information
Discovery date		16 November 2003
Discoverer(s)		Mitchell et al.
Discovery method		Radial velocity
Discovery site		United States
Discovery status		Published
Other designations
HD 219449 b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

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 a year to revolve around the star in a very circular orbit (e=<0.053).

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. 

External links

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