CoRoT-24 b
CoRoT-24 b is a puffy low-density planet orbiting the K1 V star CoRoT-24 in the constellation Monoceros. It lies about 1,929 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is CoRoT-24 b?
CoRoT-24 b has a radius of 3.70 times that of Earth. Its mass is 5.7 times that of Earth, giving it a density of 0.90 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is CoRoT-24 b in the Habitable Zone?
CoRoT-24 b orbits inside the inner edge of the habitable zone of CoRoT-24. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of CoRoT-24: 0.496–1.201 AU (conservative: 0.628–1.138 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on CoRoT-24 b
The equilibrium temperature of CoRoT-24 b is about 1,070 K (797 °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 CoRoT-24 b — one full orbit around CoRoT-24 — lasts 5.11 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.056 AU — closer to its star than Mercury is to the Sun.
How Was CoRoT-24 b Discovered?
CoRoT-24 b was discovered in 2014 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-24 b?
CoRoT-24 b is 1,929.4 light-years (591.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,929 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 33,957,440 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-24 b scores 0.20, ranking #3,883 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: CoRoT-24
CoRoT-24
- Spectral type
- K1 V
- Surface temperature
- 4,950 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.86 R☉
- Age
- 11.0 billion years (Sun: 4.6)
The CoRoT-24 Planetary System
CoRoT-24 b is one of 2 known planets in the CoRoT-24 system. Its siblings:
- CoRoT-24 c (Neptune-like)
CoRoT-24 b — Complete Data
| Radius | 3.700 Earth radii (0.330 Jupiter radii) |
|---|---|
| Mass | 5.70 Earth masses (0.018 Jupiter masses) |
| Density | 0.90 g/cm³ (Earth: 5.51) |
| Orbital period | 5.11 days |
| Orbital distance | 0.056 AU |
| Equilibrium temperature | 1,070 K (797 °C) |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 1,929.4 light-years (591.6 parsecs) |
| Constellation | Monoceros |
| Discovery method | Transit |
| Discovery facility | CoRoT |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2018-06-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About CoRoT-24 b
Is CoRoT-24 b habitable?
No — CoRoT-24 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is CoRoT-24 b?
CoRoT-24 b is about 1,929 light-years from Earth in the constellation Monoceros. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 33,957,440 years to get there.
How big is CoRoT-24 b compared to Earth?
CoRoT-24 b has 3.70 times the radius of Earth and about 5.7 times its mass.
How long is a year on CoRoT-24 b?
One orbit around CoRoT-24 takes 5.1 Earth days — short enough that 71 of its years would fit into one Earth year.
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