page_title: K2-28
section_title: Discovery
hierarchical_section_title: K2-28 / Planetary system / Discovery
caption_attribution_description: English: Spitzer Space Telescopes observation of a transit of K2-28b on February 11, 2017
context_page_description: K2-28 is a metal rich M4-type main sequence star. One confirmed transiting exoplanet is known to orbit this star. There is another star 5.2 arcseconds to the north–east of K2-28 however this star has a different proper motion and is therefore physically unrelated and probably a background star.
context_section_description: K2-28b was first noticed as a candidate extrasolar planet by Vanderburg et al. in 2016, who, in a search of 59,174 stars from the Kepler space telescope's first year of K2 observations, found 234 planetary candidates. Shortly thereafter the K2-ESPRINT Project confirmed that the candidate was a super-Earth sized planet in a close orbit around a red dwarf star.
caption: K2-28 transit light curve from the Spitzer Space Telescope.[3]
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