| Discovery | |
|---|---|
| Discovered by | Setiawan et al. |
| Discovery site | Chile, La Silla |
| Discovery date | 25 May 2005 |
| Detection method | Radial velocity |
| Orbital characteristics | |
| Semi-major axis | 1.93 AU (289,000,000 km) |
| Eccentricity | 0.40±0.07 |
| Orbital period (sidereal) | 711±8 d |
| Time of periastron | 2,451,420 |
| Argument of periastron | 351.5±9.5 |
| Semi-amplitude | 105±8 |
| Star | Eta Hydri |
| Physical characteristics | |
| Mass | >6.54 MJ |
Eta Hydri b (η Hyi b, η 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. S2CID 6362483.
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". Extrasolar Planets Encyclopaedia. Retrieved 2008-07-03.
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