HD 90156 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 90156 | |
| Constellation | Hydra | |
| Right ascension | (α) | 10h 23m 55.275s[1] |
| Declination | (δ) | –29° 38′ 43.91″[1] |
| Apparent magnitude | (mV) | 6.947 |
| Distance | 72.9 ± 0.8[1] ly (22.4 ± 0.2[1] pc) | |
| Spectral type | G5V | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.264 AU (39.4 Gm) |
| Eccentricity | (e) | 0.31 ± 0.10 |
| Orbital period | (P) | 49.8 d (0.136 y) |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 0.055 MJ (17.6 M⊕) |
| Discovery information | ||
| Discovery date | October 19, 2009 | |
| Discoverer(s) | Mordasini et al.[2] | |
| Discovery method | radial velocity (HARPS) | |
| Discovery site | La Silla Observatory | |
| Discovery status | Published[2] | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 90156 b is an extrasolar planet which orbits the G-type main sequence star HD 90156, located approximately 73 light years away[1] in the constellation Hydra. This planet has at least 17.6 times the mass of Earth and takes over seven weeks to orbit the star at a semimajor axis of 0.264 AU. Its eccentricity is 0.31 ± 0.10, while the inclination is not known, as typical for the radial velocity detection method. This planet was announced by the Swiss-led HARPS team on October 19, 2009, together with 29 other planets.
References
- 1 2 3 4 5 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 Mordasini, C.; et al. (2011). "The HARPS search for southern extrasolar planets XXIV. Companions to HD 85390, HD 90156, and HD 103197: a Neptune analog and two intermediate-mass planets". Astronomy and Astrophysics. 526. A111. arXiv:1010.0856. Bibcode:2011A&A...526A.111M. doi:10.1051/0004-6361/200913521.
Coordinates: 
10h 23m 55.2749s, −29° 38′ 43.905″
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