91 Aquarii b
| Exoplanet | List of exoplanets | |
|---|---|---|
 | ||
| Parent star | ||
| Star | 91 Aquarii A | |
| Constellation | Aquarius | |
| Right ascension | (α) | 23h 15m 53.495s[1] |
| Declination | (δ) | −09° 05′ 15.85″[1] |
| Apparent magnitude | (mV) | 4.21 |
| Distance | 150±2[1] ly (45.9±0.6[1] pc) | |
| Spectral type | K1 III[2] | |
| Mass | (m) | 1.38±0.29[2] M☉ |
| Radius | (r) | 10.96±0.21[2] R☉ |
| Temperature | (T) | 4730±68[2] K |
| Metallicity | [Fe/H] | -0.03 ± 0.1 |
| Age | 2.98±1.63[2] 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 |  | |
| 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 an Earth year to orbit around the star in a very circular orbit with eccentricity less than 0.053.
See also
References
- 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- 1 2 3 4 5 Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155. 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b.
- 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.
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