| Discovery | |
|---|---|
| Discovered by | Butler et al. | 
| Discovery site | California, United States | 
| Discovery date | 5 August 2005 Confirmed 27 May 2007 | 
| Doppler spectroscopy | |
| Orbital characteristics | |
| 0.229 AU (34,300,000 km) [1] | |
| Eccentricity | 0.15 [1] | 
| 37.82 [1] d | |
| 2,454,370 ± 380 [1] | |
| 102 [1] | |
| Semi-amplitude | 4.65 ± 0.59 [1] | 
| Star | HD 11964 | 
HD 11964 c is an extrasolar planet approximately 110 light-years away in the constellation of Cetus. The planet was discovered in a close-orbit around the yellow subgiant star HD 11964. The planet has a minimum mass 35 times the mass of Earth and is located in a mildly eccentric orbit which takes almost 38 days to complete. HD 11964 c was a possible planet discovered on the same day as HD 11964 b in 2005. HD 11964 c was first proposed in a paper published in 2007, [2] and finally confirmed with new data presented in a review of multi-planet systems which appeared on the arXiv preprint website in 2008. [1]
Some sources have used the designation "HD 11964 b" for this planet, [3] [4] however in their review of the properties of multi-planet extrasolar planetary systems, the discovery team has stated that the correct designation for this planet is HD 11964 c and the reversed system was due to confusion related to private communications between various groups of astronomers. [1]