Kepler-296d

{{Infobox planet | name = Kepler-296d | discoverer = [[Kepler (spacecraft)|Kepler spacecraft]] | discovered = 2014 | discovery_method = [[Transit method|Transit]] | semimajor = 0.118 AU | eccentricity = <0.33 | period = 19.9 d | star = [[Kepler-296]] | mean_radius = 2.09 Earth radii | mass = 5.02 Earth masses }}

'''Kepler-296d''' is an exoplanet orbiting the M-dwarf star [[Kepler-296]],<ref name=":0" /><ref name=":1">{{Cite web |date=2023-11-28 |title=Kepler-296 - NASA Science |url=https://science.nasa.gov/exoplanets/star-catalog/kepler-296/ |access-date=2025-06-28 |language=en-US}}</ref><ref name=":3">{{cite journal | url=https://iopscience.iop.org/article/10.1088/0004-637X/809/1/7/pdf | doi=10.1088/0004-637X/809/1/7 | title=The Five Planets in the Kepler-296 Binary System All Orbit the Primary: A Statistical and Analytical Analysis | date=2015 | last1=Barclay | first1=Thomas | last2=Quintana | first2=Elisa V. | last3=Adams | first3=Fred C. | last4=Ciardi | first4=David R. | last5=Huber | first5=Daniel | last6=Foreman-Mackey | first6=Daniel | last7=Montet | first7=Benjamin T. | last8=Caldwell | first8=Douglas | journal=The Astrophysical Journal | volume=809 | issue=1 | page=7 | arxiv=1505.01845 | bibcode=2015ApJ...809....7B }}</ref> located in the constellation [[Draco (constellation)|Draco]].<ref name=":4">{{Cite web |title=Kepler-296 |url=http://www.exoplanetkyoto.org/exohtml/Kepler-296.html |access-date=2025-06-28 |website=www.exoplanetkyoto.org}}</ref> It was discovered in 2014 by the [[Kepler (spacecraft)|Kepler]] space telescope using the [[transit method]].<ref name=":0" /><ref name=":2">{{Cite web |date=2017-10-02 |title=Kepler-296 d - NASA Science |url=https://science.nasa.gov/exoplanet-catalog/kepler-296-d/ |access-date=2025-06-28 |language=en-US}}</ref>

== Characteristics == Kepler-296d has a radius approximately 2.09 times<ref name=":0">{{Cite web |title=Kepler-296 {{!}} NASA Exoplanet Archive |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-296 |access-date=2025-06-28 |website=exoplanetarchive.ipac.caltech.edu}}</ref> that of [[Earth]] and a mass estimated at 5.02<ref name=":0" /><ref name=":4" /> Earth masses, placing it in the category of [[Neptune-like exoplanet]]s. The planet orbits its host star every 19.9 days at a distance of approximately 0.118 AU.<ref name=":0" /><ref name=":2" /> Its orbit has an [[Eccentricity (astronomy)|eccentricity]] of less than 0.33.<ref name=":2" />

== Host Star == The host star, [[Kepler-296]], is an [[M-type dwarf]].<ref name=":1" /> These stars are cooler and smaller than the Sun, and often host multiple exoplanets. Kepler-296 is known to host at least five planets.<ref name=":0" /><ref name=":3" />

== Discovery == Kepler-296d was identified in 2014<ref name=":0" /> as part of the data collected by NASA's [[Kepler (spacecraft)|Kepler space telescope]], which monitored the brightness of over 150,000 stars<ref>{{Cite web |date=2023-05-23 |title=Kepler / K2 - NASA Science |url=https://science.nasa.gov/mission/kepler/ |access-date=2025-06-28 |language=en-US}}</ref> to detect periodic dips in light indicative of planetary transits. The detection of Kepler-296d was achieved through the [[transit method]],<ref name=":0" /><ref name=":2" /> wherein a planet passes between its host star and the observer, causing a measurable decrease in the star’s [[apparent brightness]].

== See also == * [[List of exoplanets discovered in 2014]] * [[Exoplanet]]

== References == {{reflist}}

[[Category:Kepler-296]] [[Category:Exoplanets discovered in 2014]] [[Category:Exoplanets discovered by the Kepler space telescope]] [[Category:Transiting exoplanets]]