K2-384 b
K2-384 b is a terrestrial planet orbiting the M4 V star K2-384 in the constellation Cetus. It lies about 270 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is K2-384 b?
K2-384 b has a radius of 1.08 times that of Earth.
Is K2-384 b in the Habitable Zone?
The position of K2-384 b relative to the habitable zone of K2-384 cannot be precisely determined from the available orbital data.
Habitable zone of K2-384: 0.112–0.288 AU (conservative: 0.142–0.273 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 K2-384 b — one full orbit around K2-384 — lasts 2.23 Earth days, shorter than Mercury's 88-day year.
How Was K2-384 b Discovered?
K2-384 b was discovered in 2022 using the transit method, with observations from K2.
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 K2-384 b?
K2-384 b is 269.6 light-years (82.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1757. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,744,960 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. K2-384 b scores 0.35, ranking #791 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-384
K2-384
- Spectral type
- M4 V
- Surface temperature
- 3,623 K (Sun: 5,772 K)
- Mass
- 0.33 M☉
- Radius
- 0.35 R☉
The K2-384 Planetary System
K2-384 b is one of 5 known planets in the K2-384 system. Its siblings:
K2-384 b — Complete Data
| Radius | 1.076 Earth radii (0.096 Jupiter radii) |
|---|---|
| Orbital period | 2.23 days |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 269.6 light-years (82.7 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-03-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-384 b
Is K2-384 b habitable?
K2-384 b is not known to orbit within the habitable zone of K2-384, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is K2-384 b?
K2-384 b is about 270 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,744,960 years to get there.
How big is K2-384 b compared to Earth?
K2-384 b has 1.08 times the radius of Earth.
How long is a year on K2-384 b?
One orbit around K2-384 takes 2.2 Earth days — short enough that 164 of its years would fit into one Earth year.
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