Eta2 Hydri b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | Eta2 Hydri | |
| Constellation | Hydrus | |
| Right ascension | (α) | 01h 54m 56s |
| Declination | (δ) | −67° 38′ 50″ |
| Distance | 216.89 ly (66.53 pc) | |
| Spectral type | G8.5III | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.93 AU |
| Eccentricity | (e) | 0.40±0.07 |
| Orbital period | (P) | 711±8 d |
| Argument of periastron |
(ω) | 351.5±9.5° |
| Time of periastron | (T0) | 2,451,420 JD |
| Semi-amplitude | (K) | 105±8 m/s |
| Physical characteristics | ||
| Mass | (m) | >6.54 MJ |
| Discovery information | ||
| Discovery date | 25 May 2005 | |
| Discoverer(s) | Setiawan et al. | |
| Discovery method | Radial velocity | |
| Discovery site |  La Silla | |
| Discovery status | Published | |
Eta2 Hydri b (η2 Hyi b, η2 Hydri b), commonly known as HD 11977 b, is an extrasolar planet that is approximately 217 light-years away in the constellation of Hydrus. The presence of the planet around an intermediately massive giant star provides indirect evidence for the existence of planetary systems around A-type stars.
References
- Setiawan, J.; Rodmann, J.; Da Silva, L.; Hatzes, A. P.; Pasquini, L.; Von Der Lühe, O.; De Medeiros, J. R.; Döllinger, M. P.; Girardi, L. (2005). "A substellar companion around the intermediate-mass giant star HD 11977". Astronomy & Astrophysics 437 (2): L31–L34. arXiv:astro-ph/0505510. Bibcode:2005A&A...437L..31S. doi:10.1051/0004-6361:200500133.
External links
- "HD 11977 B, a planet around a giant star". Max-Planck-Institut für Astronomie. Archived from the original on March 14, 2007. Retrieved 2008-07-03.
- "Notes for planet HD 11977 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-03.
Coordinates: 
01h 54m 56s, −67° 38′ 50″
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