Kepler-296 e
Kepler-296 e is a super-Earth orbiting Kepler-296 in the constellation Draco. It was discovered in 2014 using the transit method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
How Big Is Kepler-296 e?
Kepler-296 e has a radius of 1.53 times that of Earth.
Is Kepler-296 e in the Habitable Zone?
Kepler-296 e orbits within the optimistic habitable zone of Kepler-296 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of Kepler-296: 0.164–0.420 AU (conservative: 0.208–0.399 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on Kepler-296 e
Kepler-296 e receives 1.41 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-296 e — one full orbit around Kepler-296 — lasts 34.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.169 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.33), swinging dramatically closer to and farther from its star.
How Was Kepler-296 e Discovered?
Kepler-296 e was discovered in 2014 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-296 e scores 0.85, ranking #14 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-296
Kepler-296 e belongs to a system of 2 stars; it orbits Kepler-296.
Kepler-296
- Surface temperature
- 3,740 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.48 R☉
The Kepler-296 Planetary System
Kepler-296 e is one of 5 known planets in the Kepler-296 system. Its siblings:
- Kepler-296 b (Super Earth)
- Kepler-296 c (Super Earth)
- Kepler-296 d (Mini Neptune)
- Kepler-296 f (Super Earth)
Kepler-296 e — Complete Data
| Radius | 1.530 Earth radii (0.136 Jupiter radii) |
|---|---|
| Orbital period | 34.14 days |
| Orbital distance | 0.169 AU |
| Eccentricity | 0.330 |
| Stellar irradiation | 1.41× Earth |
| Earth Similarity Index | 0.85 |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2015-09-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-296 e
Is Kepler-296 e habitable?
Kepler-296 e orbits within the habitable zone of Kepler-296, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How big is Kepler-296 e compared to Earth?
Kepler-296 e has 1.53 times the radius of Earth.
How long is a year on Kepler-296 e?
One orbit around Kepler-296 takes 34.1 Earth days — short enough that 11 of its years would fit into one Earth year.
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