HD 10180 c

{{Short description|Extrasolar planet in the constrellation Hydrus}}

{{Infobox planet

| name = HD 10180 c

| image =HD10180InnerOrbits.svg

| caption = 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.

| discovered = 24 August 2010

| apsis = astron

| semimajor = {{convert|0.0641|±|0.0010|AU|km|abbr=on}}

| mass = >0.0416{{±|0.0014}} {{Jupiter mass}}

| eccentricity = 0.073{{±|0.031}}

| period = 5.75969{{±|0.00028}} d{{citation|arxiv=1408.4150|title=On the Inclination and Habitability of the HD 10180 System|year=2014 |doi=10.1088/0004-637X/792/2/111 |last1=Kane |first1=Stephen R. |last2=Gelino |first2=Dawn M. |journal=The Astrophysical Journal |volume=792 |issue=2 |page=111 |bibcode=2014ApJ...792..111K |s2cid=42857278 }}

| avg_speed = 136

| arg_peri = 328{{±|24}}

| star = HD 10180

}}

HD 10180 c is an exoplanet approximately 130 light-years away in the constellation Hydrus.{{Cite web|url=http://www.openexoplanetcatalogue.com/planet/HD%2010180%20c/|title=Open Exoplanet Catalogue - HD 10180 c|website=www.openexoplanetcatalogue.com|access-date=2020-01-09}} It was discovered in 2010 using the radial velocity method. With a minimum mass comparable to that of Neptune,{{Cite web|url=https://exoplanets.nasa.gov/exoplanet-catalog/6806/hd-10180-c/|title=Exoplanet-catalog|website=Exoplanet Exploration: Planets Beyond our Solar System|access-date=2020-01-09}} it is of the class of planets known as Hot Neptunes.{{Citation needed|date=January 2020}} 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.{{Citation needed|date=January 2020}}