# Kepler-296d

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Exoplanet Kepler 296 d

Kepler-296d Discovery Discovered by Kepler spacecraft Discovery date 2014 Detection method Transit Orbital characteristics Semi-major axis 0.118 AU Eccentricity <0.33 Orbital period (sidereal) 19.9 d Star Kepler-296 Physical characteristics Mean radius 2.09 Earth radii Mass 5.02 Earth masses

**Kepler-296d** is an exoplanet orbiting the M-dwarf star [Kepler-296](/source/Kepler-296),[1][2][3] located in the constellation [Draco](/source/Draco_(constellation)).[4] It was discovered in 2014 by the [Kepler](/source/Kepler_(spacecraft)) space telescope using the [transit method](/source/Transit_method).[1][5]

## Characteristics

Kepler-296d has a radius approximately 2.09 times[1] that of [Earth](/source/Earth) and a mass estimated at 5.02[1][4] Earth masses, placing it in the category of [Neptune-like exoplanets](/source/Neptune-like_exoplanet). The planet orbits its host star every 19.9 days at a distance of approximately 0.118 AU.[1][5] Its orbit has an [eccentricity](/source/Eccentricity_(astronomy)) of less than 0.33.[5]

## Host Star

The host star, [Kepler-296](/source/Kepler-296), is an [M-type dwarf](/source/M-type_dwarf).[2] These stars are cooler and smaller than the Sun, and often host multiple exoplanets. Kepler-296 is known to host at least five planets.[1][3]

## Discovery

Kepler-296d was identified in 2014[1] as part of the data collected by NASA's [Kepler space telescope](/source/Kepler_(spacecraft)), which monitored the brightness of over 150,000 stars[6] to detect periodic dips in light indicative of planetary transits. The detection of Kepler-296d was achieved through the [transit method](/source/Transit_method),[1][5] wherein a planet passes between its host star and the observer, causing a measurable decrease in the star’s [apparent brightness](/source/Apparent_brightness).

## See also

- [List of exoplanets discovered in 2014](/source/List_of_exoplanets_discovered_in_2014)

- [Exoplanet](/source/Exoplanet)

## References

1. ^ [***a***](#cite_ref-:0_1-0) [***b***](#cite_ref-:0_1-1) [***c***](#cite_ref-:0_1-2) [***d***](#cite_ref-:0_1-3) [***e***](#cite_ref-:0_1-4) [***f***](#cite_ref-:0_1-5) [***g***](#cite_ref-:0_1-6) [***h***](#cite_ref-:0_1-7) ["Kepler-296 | NASA Exoplanet Archive"](https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-296). *exoplanetarchive.ipac.caltech.edu*. Retrieved 2025-06-28.

1. ^ [***a***](#cite_ref-:1_2-0) [***b***](#cite_ref-:1_2-1) ["Kepler-296 - NASA Science"](https://science.nasa.gov/exoplanets/star-catalog/kepler-296/). 2023-11-28. Retrieved 2025-06-28.

1. ^ [***a***](#cite_ref-:3_3-0) [***b***](#cite_ref-:3_3-1) Barclay, Thomas; Quintana, Elisa V.; Adams, Fred C.; Ciardi, David R.; Huber, Daniel; Foreman-Mackey, Daniel; Montet, Benjamin T.; Caldwell, Douglas (2015). ["The Five Planets in the Kepler-296 Binary System All Orbit the Primary: A Statistical and Analytical Analysis"](https://iopscience.iop.org/article/10.1088/0004-637X/809/1/7/pdf). *The Astrophysical Journal*. **809** (1): 7. [arXiv](/source/ArXiv_(identifier)):[1505.01845](https://arxiv.org/abs/1505.01845). [Bibcode](/source/Bibcode_(identifier)):[2015ApJ...809....7B](https://ui.adsabs.harvard.edu/abs/2015ApJ...809....7B). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/809/1/7](https://doi.org/10.1088%2F0004-637X%2F809%2F1%2F7).

1. ^ [***a***](#cite_ref-:4_4-0) [***b***](#cite_ref-:4_4-1) ["Kepler-296"](http://www.exoplanetkyoto.org/exohtml/Kepler-296.html). *www.exoplanetkyoto.org*. Retrieved 2025-06-28.

1. ^ [***a***](#cite_ref-:2_5-0) [***b***](#cite_ref-:2_5-1) [***c***](#cite_ref-:2_5-2) [***d***](#cite_ref-:2_5-3) ["Kepler-296 d - NASA Science"](https://science.nasa.gov/exoplanet-catalog/kepler-296-d/). 2017-10-02. Retrieved 2025-06-28.

1. **[^](#cite_ref-6)** ["Kepler / K2 - NASA Science"](https://science.nasa.gov/mission/kepler/). 2023-05-23. Retrieved 2025-06-28.

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Adapted from the Wikipedia article [Kepler-296d](https://en.wikipedia.org/wiki/Kepler-296d) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Kepler-296d?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.