CoRoT-2 b
CoRoT-2 b is a hot Jupiter orbiting CoRoT-2 in the constellation Aquila. It lies about 696 light-years from Earth and was discovered in 2008 using the transit method.
How Big Is CoRoT-2 b?
CoRoT-2 b has a radius of 16.43 times that of Earth, or 1.47 times the radius of Jupiter. Its mass is 1,103 times that of Earth, giving it a density of 1.47 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is CoRoT-2 b in the Habitable Zone?
CoRoT-2 b orbits inside the inner edge of the habitable zone of CoRoT-2. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of CoRoT-2: 0.650–1.539 AU (conservative: 0.824–1.459 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on CoRoT-2 b — one full orbit around CoRoT-2 — lasts just 41.8 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.028 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.014).
How Was CoRoT-2 b Discovered?
CoRoT-2 b was discovered in 2008 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-2 b?
CoRoT-2 b is 695.6 light-years (213.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1331. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,242,560 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-2 b scores 0.06, ranking #5,208 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: CoRoT-2
CoRoT-2 b belongs to a system of 2 stars; it orbits CoRoT-2.
CoRoT-2
- Surface temperature
- 5,625 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 0.91 R☉
- Age
- 2.7 billion years (Sun: 4.6)
Planetary System
CoRoT-2 b is the only planet known to orbit CoRoT-2 so far.
CoRoT-2 b — Complete Data
| Radius | 16.432 Earth radii (1.466 Jupiter radii) |
|---|---|
| Mass | 1,102.82 Earth masses (3.470 Jupiter masses) |
| Density | 1.47 g/cm³ (Earth: 5.51) |
| Orbital period | 1.74 days |
| Orbital distance | 0.028 AU |
| Eccentricity | 0.014 |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 695.6 light-years (213.3 parsecs) |
| Constellation | Aquila |
| Discovery method | Transit |
| Discovery facility | CoRoT |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About CoRoT-2 b
Is CoRoT-2 b habitable?
No — CoRoT-2 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is CoRoT-2 b?
CoRoT-2 b is about 696 light-years from Earth in the constellation Aquila. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,242,560 years to get there.
How big is CoRoT-2 b compared to Earth?
CoRoT-2 b has 16.43 times the radius of Earth and about 1,103 times its mass.
How long is a year on CoRoT-2 b?
One orbit around CoRoT-2 takes 1.7 Earth days — short enough that 210 of its years would fit into one Earth year.
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