Kepler-394 d
Kepler-394 d is a super-Earth orbiting Kepler-394 in the constellation Cygnus. It lies about 3,453 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-394 d?
Kepler-394 d has a radius of 1.50 times that of Earth.
Is Kepler-394 d in the Habitable Zone?
The position of Kepler-394 d relative to the habitable zone of Kepler-394 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-394: 1.004–2.335 AU (conservative: 1.272–2.213 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-394 d — one full orbit around Kepler-394 — lasts 5.61 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-394 d Discovered?
Kepler-394 d was discovered in 2021 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-394 d?
Kepler-394 d is 3,453.1 light-years (1,058.7 parsecs) from Earth. Light arriving here tonight left the planet about 3,453 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 60,774,560 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-394 d scores 0.28, ranking #2,113 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-394
Kepler-394
- Surface temperature
- 6,402 K (Sun: 5,772 K)
- Radius
- 1.13 R☉
The Kepler-394 Planetary System
Kepler-394 d is one of 3 known planets in the Kepler-394 system. Its siblings:
- Kepler-394 b (Super Earth)
- Kepler-394 c (Super Earth)
Kepler-394 d — Complete Data
| Radius | 1.501 Earth radii (0.134 Jupiter radii) |
|---|---|
| Orbital period | 5.61 days |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 3,453.1 light-years (1,058.7 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-394 d
Is Kepler-394 d habitable?
Kepler-394 d is not known to orbit within the habitable zone of Kepler-394, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-394 d?
Kepler-394 d is about 3,453 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 60,774,560 years to get there.
How big is Kepler-394 d compared to Earth?
Kepler-394 d has 1.50 times the radius of Earth.
How long is a year on Kepler-394 d?
One orbit around Kepler-394 takes 5.6 Earth days — short enough that 65 of its years would fit into one Earth year.
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