HD 10180 c

HD 10180 c

Exoplanet		List of exoplanets
Parent star
Star		HD 10180
Constellation		Hydrus
Right ascension	(α)	01^h 37^m 53.5763^s
Declination	(δ)	−60° 30′ 41.499″
Apparent magnitude	(mV)	7.33
Distance		128 ± 3 ly (39.4 ± 1 pc)
Spectral type		G1V
Mass	(m)	1.062 ± 0.017 M☉
Radius	(r)	1.20 ± 0.318 R☉
Temperature	(T)	5911 K
Metallicity	[Fe/H]	=$\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ 0.08\end{smallmatrix}$
Age		7.3 Gyr
Orbital elements
Semi-major axis	(a)	0.0641 ± 0.0010 AU
Eccentricity	(e)	0.045 ± 0.026
Orbital period	(P)	5.75979 ± 0.00062 d
Orbital speed	(υ)	136 km/s
Argument of periastron	(ω)	332 ± 43°
Physical characteristics
Minimum mass	(m sin i)	13.10 ± 0.54 M⊕
Discovery information
Discovery date		24 August 2010
Discoverer(s)
Discovery status		Published
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 10180 c is an extrasolar planet approximately 130 light-years away in the constellation Hydrus. 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.

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.

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