CoRoT-31 b
CoRoT-31 b is a hot Jupiter orbiting the G2 IV star CoRoT-31 in the constellation Monoceros. It lies about 6,542 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is CoRoT-31 b?
CoRoT-31 b has a radius of 16.37 times that of Earth, or 1.46 times the radius of Jupiter. Its mass is 267 times that of Earth, giving it a density of 0.33 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is CoRoT-31 b in the Habitable Zone?
CoRoT-31 b orbits inside the inner edge of the habitable zone of CoRoT-31. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of CoRoT-31: 1.578–3.725 AU (conservative: 1.998–3.531 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 CoRoT-31 b — one full orbit around CoRoT-31 — lasts 4.63 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.059 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.020).
How Was CoRoT-31 b Discovered?
CoRoT-31 b was discovered in 2020 using the transit method, with observations from CoRoT.
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 CoRoT-31 b?
CoRoT-31 b is 6,541.9 light-years (2,005.8 parsecs) from Earth. Light arriving here tonight left the planet about 6,542 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 115,137,440 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. CoRoT-31 b scores 0.06, ranking #5,199 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: CoRoT-31
CoRoT-31
- Spectral type
- G2 IV
- Surface temperature
- 5,700 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 2.15 R☉
- Age
- 4.7 billion years (Sun: 4.6)
Planetary System
CoRoT-31 b is the only planet known to orbit CoRoT-31 so far.
CoRoT-31 b — Complete Data
| Radius | 16.365 Earth radii (1.460 Jupiter radii) |
|---|---|
| Mass | 266.98 Earth masses (0.840 Jupiter masses) |
| Density | 0.33 g/cm³ (Earth: 5.51) |
| Orbital period | 4.63 days |
| Orbital distance | 0.059 AU |
| Eccentricity | 0.020 |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 6,541.9 light-years (2,005.8 parsecs) |
| Constellation | Monoceros |
| Discovery method | Transit |
| Discovery facility | CoRoT |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-04-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About CoRoT-31 b
Is CoRoT-31 b habitable?
No — CoRoT-31 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is CoRoT-31 b?
CoRoT-31 b is about 6,542 light-years from Earth in the constellation Monoceros. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 115,137,440 years to get there.
How big is CoRoT-31 b compared to Earth?
CoRoT-31 b has 16.37 times the radius of Earth and about 267 times its mass.
How long is a year on CoRoT-31 b?
One orbit around CoRoT-31 takes 4.6 Earth days — short enough that 79 of its years would fit into one Earth year.
Explore CoRoT-31 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.
