HD 11964 c
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 11964 | |
| Constellation | Cetus | |
| Right ascension | (α) | 01h 57m 09.6064s |
| Declination | (δ) | −10° 14′ 32.739″ |
| Apparent magnitude | (mV) | 6.415 |
| Distance | 107 ly (33 pc) |
|
| Spectral type | G5IV | |
| Mass | (m) | 1.125 M☉ |
| Radius | (r) | 2.234 ± 0.304 R☉ |
| Temperature | (T) | 5552 K |
| Metallicity | [Fe/H] | 0.17 |
| Age | 9.56 Gyr | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.229[1] AU (34.3 Gm) |
| Periastron | (q) | 0.195 AU (29.1 Gm) |
| Apastron | (Q) | 0.263 AU (39.4 Gm) |
| Eccentricity | (e) | 0.15[1] |
| Orbital period | (P) | 37.82[1] d (0.1035 y) |
| Orbital speed | (υ) | 66.1 km/s |
| Argument of periastron |
(ω) | 102[1]° |
| Time of periastron | (T0) | 2,454,370 ± 380[1] JD |
| Semi-amplitude | (K) | 4.65 ± 0.59[1] m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 0.11[1] MJ (35 M⊕) |
| Discovery information | ||
| Discovery date | 5 August 2005 Confirmed 27 May 2007 |
|
| Discoverer(s) | Butler et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery site | California,  United States |
|
| Discovery status | Confirmed | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 11964 c is an extrasolar planet approximately 107 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]
References
Coordinates: 
01h 57m 09.6064s, −10° 14′ 32.739″
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