K2-333 b
K2-333 b is a cold gas giant orbiting K2-333 in the constellation Cancer. It lies about 1,122 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is K2-333 b?
K2-333 b has a radius of 6.18 times that of Earth, or 0.55 times the radius of Jupiter.
Is K2-333 b in the Habitable Zone?
The position of K2-333 b relative to the habitable zone of K2-333 cannot be precisely determined from the available orbital data.
Habitable zone of K2-333: 0.942–2.214 AU (conservative: 1.194–2.099 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 K2-333 b
The equilibrium temperature of K2-333 b is about 826 K (553 °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 K2-333 b — one full orbit around K2-333 — lasts 14.8 Earth days, shorter than Mercury's 88-day year.
How Was K2-333 b Discovered?
K2-333 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 K2-333 b?
K2-333 b is 1,121.9 light-years (344.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,122 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,745,440 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. K2-333 b scores 0.14, ranking #4,255 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-333
K2-333
- Surface temperature
- 5,880 K (Sun: 5,772 K)
- Mass
- 1.06 M☉
- Radius
- 1.22 R☉
Planetary System
K2-333 b is the only planet known to orbit K2-333 so far.
K2-333 b — Complete Data
| Radius | 6.180 Earth radii (0.551 Jupiter radii) |
|---|---|
| Orbital period | 14.76 days |
| Equilibrium temperature | 826 K (553 °C) |
| Earth Similarity Index | 0.14 |
| Distance from Earth | 1,121.9 light-years (344.0 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 K2-333 b
Is K2-333 b habitable?
K2-333 b is not known to orbit within the habitable zone of K2-333, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is K2-333 b?
K2-333 b is about 1,122 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,745,440 years to get there.
How big is K2-333 b compared to Earth?
K2-333 b has 6.18 times the radius of Earth.
How long is a year on K2-333 b?
One orbit around K2-333 takes 14.8 Earth days — short enough that 25 of its years would fit into one Earth year.
Explore K2-333 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
