K2-18, also known as EPIC 201912552, is a

red dwarf ''Red Dwarf'' is a British science fiction comedy franchise created by Rob Grant and Doug Naylor, which primarily consists of a television sitcom that aired on BBC Two between 1988 and 1999, and on Dave since 2009, gaining a cult following. T ...

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

located from Earth, in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Leo Leo or Léo may refer to: Acronyms * Law enforcement officer * Law enforcement organisation * ''Louisville Eccentric Observer'', a free weekly newspaper in Louisville, Kentucky * Michigan Department of Labor and Economic Opportunity Arts an ...

Planetary system

The star has an

exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not recognized as such. The first confirmation of detection occurred in 1992. A different planet, init ...

, called K2-18b, a super-Earth located within the habitable zone of K2-18. It is the first exoplanet in the habitable zone, albeit a hydrogen-rich sub-neptune,No, the Exoplanet K2-18b Is Not Habitable
/ref> to have water discovered in its atmosphere. The star also has a second planet K2-18c, which is proven by system tidal simulation to be a small gas giant.

References

Leo (constellation) M-type main-sequence stars Planetary systems with one confirmed planet J11301450+0735180 {{main-star-stub