HIP 5158 c

{{Short description|Extrasolar planet in the constellation Cetus}}

{{Infobox planet

| name = HIP 5158 c

| discoverer = HARPS

| discovered = October 19, 2009

| discovery_method = radial velocity

| apsis = astron

| semimajor = {{convert|7.7|AU|km|abbr=on}}

| star = HIP 5158

}}

HIP 5158 c is an extrasolar planet, orbiting the 10th magnitude K-type main sequence star HIP 5158 about 135 lightyears away from Earth, in the constellation Cetus.

It orbits its primary star at an average distance (semi-major axis) of 7.7 AU. The actual orbital period is unknown, but is estimated to be somewhere in between 9,018 and 12,200 days. It travels with an eccentricity of 0.14. It also has an estimated minimal mass 15.04 {{Jupiter mass}}. It was discovered by HARPS on October 19, 2009, together with 29 other planets, and confirmed in May 2011.{{citation|arxiv=1105.1150|title=Bayesian evidence for two companions orbiting HIP 5158|year=2011|doi=10.1111/j.1745-3933.2011.01109.x |last1=Feroz |first1=F. |last2=Balan |first2=S. T. |last3=Hobson |first3=M. P. |journal=Monthly Notices of the Royal Astronomical Society: Letters |volume=416 |issue=1 |pages=L104–L108 |doi-access=free |bibcode=2011MNRAS.416L.104F |s2cid=118517956 }}

Being heavier than 13 {{Jupiter mass}}, the HIP 5158 c can be classified either as brown dwarf or as superjovian planet.