CoRoT-17 b
CoRoT-17 b is a hot Jupiter orbiting the G2 V star CoRoT-17 in the constellation Scutum. It lies about 3,836 light-years from Earth and was discovered in 2011 using the transit method.
How Big Is CoRoT-17 b?
CoRoT-17 b has a radius of 11.43 times that of Earth, or 1.02 times the radius of Jupiter. Its mass is 772 times that of Earth, giving it a density of 2.82 g/cm³ — between that of rocky and gaseous planets.
Is CoRoT-17 b in the Habitable Zone?
CoRoT-17 b orbits inside the inner edge of the habitable zone of CoRoT-17. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of CoRoT-17: 1.180–2.784 AU (conservative: 1.495–2.639 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on CoRoT-17 b
The equilibrium temperature of CoRoT-17 b is about 1,626 K (1,353 °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-17 b — one full orbit around CoRoT-17 — lasts 3.77 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.046 AU — closer to its star than Mercury is to the Sun.
How Was CoRoT-17 b Discovered?
CoRoT-17 b was discovered in 2011 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-17 b?
CoRoT-17 b is 3,836.0 light-years (1,176.1 parsecs) from Earth. Light arriving here tonight left the planet about 3,836 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 67,513,600 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-17 b scores 0.08, ranking #4,697 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: CoRoT-17
CoRoT-17
- Spectral type
- G2 V
- Surface temperature
- 5,740 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 1.59 R☉
- Age
- 10.7 billion years (Sun: 4.6)
Planetary System
CoRoT-17 b is the only planet known to orbit CoRoT-17 so far.
CoRoT-17 b — Complete Data
| Radius | 11.430 Earth radii (1.020 Jupiter radii) |
|---|---|
| Mass | 772.29 Earth masses (2.430 Jupiter masses) |
| Density | 2.82 g/cm³ (Earth: 5.51) |
| Orbital period | 3.77 days |
| Orbital distance | 0.046 AU |
| Equilibrium temperature | 1,626 K (1,353 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 3,836.0 light-years (1,176.1 parsecs) |
| Constellation | Scutum |
| Discovery method | Transit |
| Discovery facility | CoRoT |
| Discovery year | 2011 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About CoRoT-17 b
Is CoRoT-17 b habitable?
No — CoRoT-17 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is CoRoT-17 b?
CoRoT-17 b is about 3,836 light-years from Earth in the constellation Scutum. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 67,513,600 years to get there.
How big is CoRoT-17 b compared to Earth?
CoRoT-17 b has 11.43 times the radius of Earth and about 772 times its mass.
How long is a year on CoRoT-17 b?
One orbit around CoRoT-17 takes 3.8 Earth days — short enough that 97 of its years would fit into one Earth year.
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