K2-334 b
K2-334 b is a Neptune-like planet orbiting K2-334 in the constellation Cancer. It lies about 1,213 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is K2-334 b?
K2-334 b has a radius of 5.65 times that of Earth, or 0.50 times the radius of Jupiter.
Is K2-334 b in the Habitable Zone?
The position of K2-334 b relative to the habitable zone of K2-334 cannot be precisely determined from the available orbital data.
Habitable zone of K2-334: 1.355–3.146 AU (conservative: 1.717–2.983 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 K2-334 b
The equilibrium temperature of K2-334 b is about 1,380 K (1,107 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on K2-334 b — one full orbit around K2-334 — lasts 5.11 Earth days, shorter than Mercury's 88-day year.
How Was K2-334 b Discovered?
K2-334 b was discovered in 2021 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 K2-334 b?
K2-334 b is 1,212.7 light-years (371.8 parsecs) from Earth. Light arriving here tonight left the planet about 1,213 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,343,520 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. K2-334 b scores 0.14, ranking #4,256 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-334
K2-334
- Surface temperature
- 6,502 K (Sun: 5,772 K)
- Mass
- 1.36 M☉
- Radius
- 1.49 R☉
Planetary System
K2-334 b is the only planet known to orbit K2-334 so far.
K2-334 b — Complete Data
| Radius | 5.650 Earth radii (0.504 Jupiter radii) |
|---|---|
| Orbital period | 5.11 days |
| Equilibrium temperature | 1,380 K (1,107 °C) |
| Earth Similarity Index | 0.14 |
| Distance from Earth | 1,212.7 light-years (371.8 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-08-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-334 b
Is K2-334 b habitable?
K2-334 b is not known to orbit within the habitable zone of K2-334, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is K2-334 b?
K2-334 b is about 1,213 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,343,520 years to get there.
How big is K2-334 b compared to Earth?
K2-334 b has 5.65 times the radius of Earth.
How long is a year on K2-334 b?
One orbit around K2-334 takes 5.1 Earth days — short enough that 71 of its years would fit into one Earth year.
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