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HD 10180 c

Orbits of the inner planets of the HD 10180 planetary system, using the orbital configuration from an eight-body (the star and seven planets) Newtonian model taking into account tidal dissipation.
Discovery
Discovery date	24 August 2010
Orbital characteristics
Semi-major axis	0.0641 ± 0.0010 AU (9,590,000 ± 150,000 km)
Eccentricity	0.073±0.031
Orbital period (sidereal)	5.75969±0.00028 d
Average orbital speed	136
Argument of periastron	328±24
Star	HD 10180
Physical characteristics
Mass	>0.0416±0.0014 MJ

HD 10180 c is an exoplanet approximately 130 light-years away in the constellation Hydrus. It was discovered in 2010 using the radial velocity method. With a minimum mass comparable to that of Neptune, it is of the class of planets known as Hot Neptunes. Dynamical simulations suggest that if the mass gradient was any more than a factor of two, the system would not be stable.

While planet c does not exist in any mean motion resonances, both planets with adjacent orbits (b and d) share near resonances with c.

References

1. ^ Kane, Stephen R.; Gelino, Dawn M. (2014), "On the Inclination and Habitability of the HD 10180 System", The Astrophysical Journal, 792 (2): 111, arXiv:1408.4150, Bibcode:2014ApJ...792..111K, doi:10.1088/0004-637X/792/2/111, S2CID 42857278
2. ^ "Open Exoplanet Catalogue - HD 10180 c". www.openexoplanetcatalogue.com. Retrieved 2020-01-09.
3. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2020-01-09.

v t e Constellation of Hydrus
List of stars in Hydrus Hydrus in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η η θ ι κ λ μ ν π π σ τ τ Variable VW HD 1237 10180 20003 Other AB8 SMSS J0313−6708 WISEPC J014807.25−720258.7
Exoplanets η Hydri b GJ 3021 b HD 10180 c
Star clusters NGC 602 NGC 643 NGC 1466
Galaxies	NGC 646 802 813 Other KKs 3 PGC 6240 Small Magellanic Cloud (mostly in Tucana) Large Magellanic Cloud (mostly in Dorado, partly in Mensa)
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