91 Aquarii b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
 | ||
| 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 | 148 ly (46 pc) | |
| Spectral type | K0III | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.324 AU |
| Eccentricity | (e) | 0.003 |
| Orbital period | (P) | 181.84 d |
| Argument of periastron |
(ω) | 129.57° |
| Time of periastron | (T0) | 2,454,478.1 JD |
| Semi-amplitude | (K) | 97.3 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 2.942 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 48.5 Gm from its star, which is closer than Mercury is to the Sun (57.9 Gm). The planet takes half a year to revolve around the star in a very circular orbit (e=0.003).
See also
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: 
23h 15m 53.5s, −09° 05′ 16″