Kepler-304 e
Kepler-304 e is a terrestrial planet orbiting Kepler-304 in the constellation Cygnus. It lies about 1,418 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-304 e?
Kepler-304 e has a radius of 1.20 times that of Earth.
Is Kepler-304 e in the Habitable Zone?
The position of Kepler-304 e relative to the habitable zone of Kepler-304 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-304: 0.365–0.893 AU (conservative: 0.462–0.846 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 ›
Orbit and Year Length
A year on Kepler-304 e — one full orbit around Kepler-304 — lasts just 36.0 hours, shorter than Mercury's 88-day year.
How Was Kepler-304 e Discovered?
Kepler-304 e was discovered in 2016 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.
How Far Away Is Kepler-304 e?
Kepler-304 e is 1,417.7 light-years (434.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,418 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 24,951,520 years to make the journey.
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-304 e scores 0.29, ranking #1,644 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-304
Kepler-304
- Surface temperature
- 4,731 K (Sun: 5,772 K)
- Radius
- 0.69 R☉
The Kepler-304 Planetary System
Kepler-304 e is one of 4 known planets in the Kepler-304 system. Its siblings:
- Kepler-304 b (Mini Neptune)
- Kepler-304 c (Mini Neptune)
- Kepler-304 d (Mini Neptune)
Kepler-304 e — Complete Data
| Radius | 1.200 Earth radii (0.107 Jupiter radii) |
|---|---|
| Orbital period | 1.50 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 1,417.7 light-years (434.7 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-05-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-304 e
Is Kepler-304 e habitable?
Kepler-304 e is not known to orbit within the habitable zone of Kepler-304, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is Kepler-304 e?
Kepler-304 e is about 1,418 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 24,951,520 years to get there.
How big is Kepler-304 e compared to Earth?
Kepler-304 e has 1.20 times the radius of Earth.
How long is a year on Kepler-304 e?
One orbit around Kepler-304 takes 1.5 Earth days — short enough that 244 of its years would fit into one Earth year.
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