# 23 Librae c

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Extrasolar planet

23 Librae c Discovery Discovered by Jones et al.[1] Discovery site Keck Observatory Discovery date December 14, 2009 Detection method Radial velocity Orbital characteristics Apastron 6.5 AU (970,000,000 km) Periastron 5.1 AU (760,000,000 km) Semi-major axis 5.8 ± 0.5 AU (868,000,000 ± 75,000,000 km) Eccentricity 0.12 ± 0.02 Orbital period (sidereal) 5000 ± 400 d 14 ± 1 y Time of periastron 2,461,100 ± 600 Argument of periastron 195 ± 48 Star 23 Librae

**23 Librae c** (23 Lib c) is an [extrasolar planet](/source/Extrasolar_planet) like [Jupiter](/source/Jupiter) discovered in 2009 orbiting the star [23 Librae](/source/23_Librae). It has one of the longest known orbits of a planet detected via [radial velocity](/source/Radial_velocity_method).[1] The actual orbital period of this planet range from 4600 to 5400 days (from 12.5 to 15 years). The reason the error range for orbital period is so large is because this planet did not complete the orbit during the time of continuous observations. Using the range of orbital periods, this planet's average distance would sit between 5.3 and 6.3 [AU](/source/Astronomical_Unit).

## References

1. ^ [***a***](#cite_ref-Jones2010_1-0) [***b***](#cite_ref-Jones2010_1-1) Jones, Hugh R. A.; et al. (2010). ["A long-period planet orbiting a nearby Sun-like star"](https://doi.org/10.1111%2Fj.1365-2966.2009.16232.x). *Monthly Notices of the Royal Astronomical Society*. **403** (4): 1703–1713. [arXiv](/source/ArXiv_(identifier)):[0912.2716](https://arxiv.org/abs/0912.2716). [Bibcode](/source/Bibcode_(identifier)):[2010MNRAS.403.1703J](https://ui.adsabs.harvard.edu/abs/2010MNRAS.403.1703J). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2009.16232.x](https://doi.org/10.1111%2Fj.1365-2966.2009.16232.x).

v t e 23 Librae system Stars 23 Librae Planets 23 Librae b 23 Librae c

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