Kepler-385 d
Kepler-385 d is a mini-Neptune orbiting Kepler-385 in the constellation Cygnus. It lies about 4,673 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is Kepler-385 d?
Kepler-385 d has a radius of 2.62 times that of Earth.
Is Kepler-385 d in the Habitable Zone?
The position of Kepler-385 d relative to the habitable zone of Kepler-385 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-385: 0.980–2.281 AU (conservative: 1.241–2.162 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-385 d — one full orbit around Kepler-385 — lasts 56.4 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-385 d Discovered?
Kepler-385 d was discovered in 2020 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-385 d?
Kepler-385 d is 4,672.5 light-years (1,432.6 parsecs) from Earth. Light arriving here tonight left the planet about 4,673 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 82,236,000 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-385 d scores 0.30, ranking #1,265 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-385
Kepler-385
- Surface temperature
- 6,326 K (Sun: 5,772 K)
- Radius
- 1.13 R☉
The Kepler-385 Planetary System
Kepler-385 d is one of 3 known planets in the Kepler-385 system. Its siblings:
- Kepler-385 b (Mini Neptune)
- Kepler-385 c (Sub Neptune)
Kepler-385 d — Complete Data
| Radius | 2.619 Earth radii (0.234 Jupiter radii) |
|---|---|
| Orbital period | 56.42 days |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 4,672.5 light-years (1,432.6 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-09-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-385 d
Is Kepler-385 d habitable?
Kepler-385 d is not known to orbit within the habitable zone of Kepler-385, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-385 d?
Kepler-385 d is about 4,673 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 82,236,000 years to get there.
How big is Kepler-385 d compared to Earth?
Kepler-385 d has 2.62 times the radius of Earth.
How long is a year on Kepler-385 d?
One orbit around Kepler-385 takes 56.4 Earth days.
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