HR 7722 c
HR 7722 c is an exoplanet orbiting the star HD 192310 (HR 7722) which is about 29 light years away in the far south-west of Capricornus.[1] It is a Neptune-sized planet and was discovered on 17 August 2011 by the HARPS program.
| Discovery | |
|---|---|
| Discovery site | La Silla Observatory |
| Radial velocity (HARPS) | |
| Orbital characteristics | |
| Star | HR 7722 |
| Physical characteristics | |
| Temperature | 172 K |
The planet has a mass of ≥24 ± 5 Earth masses (M⊕) and orbits its parent star at a semimajor axis of 1.18 ± 0.025 AU, an eccentricity of 0.32 ± 0.11, and in 525.8 ± 9.2 days. Its orbit lies mainly beyond HR 7722's habitable zone, meaning it is too cold to support directly analogous advanced known life, but due to its elliptical orbit, passes into the habitable zone briefly each orbit.
References
- Pepe, F.; et al. (2011). "The HARPS search for Earth-like planets in the habitable zone: I – Very low-mass planets around HD20794, HD85512 and HD192310". Astronomy & Astrophysics. 534: A58. arXiv:1108.3447. Bibcode:2011A&A...534A..58P. doi:10.1051/0004-6361/201117055. S2CID 15088852.
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