CoRoT-28 b
CoRoT-28 b is a hot Jupiter orbiting the G8/9 IV star CoRoT-28 in the constellation Serpens. It lies about 2,499 light-years from Earth and was discovered in 2015 using the transit method.
How Big Is CoRoT-28 b?
CoRoT-28 b has a radius of 10.70 times that of Earth, or 0.96 times the radius of Jupiter. Its mass is 154 times that of Earth, giving it a density of 0.69 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is CoRoT-28 b in the Habitable Zone?
CoRoT-28 b orbits inside the inner edge of the habitable zone of CoRoT-28. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of CoRoT-28: 1.099–2.643 AU (conservative: 1.393–2.506 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-28 b — one full orbit around CoRoT-28 — lasts 5.21 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.060 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.047).
How Was CoRoT-28 b Discovered?
CoRoT-28 b was discovered in 2015 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-28 b?
CoRoT-28 b is 2,499.0 light-years (766.2 parsecs) from Earth. Light arriving here tonight left the planet about 2,499 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 43,982,400 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-28 b scores 0.08, ranking #4,611 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: CoRoT-28
CoRoT-28
- Spectral type
- G8/9 IV
- Surface temperature
- 5,150 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 1.78 R☉
- Age
- 12.0 billion years (Sun: 4.6)
Planetary System
CoRoT-28 b is the only planet known to orbit CoRoT-28 so far.
CoRoT-28 b — Complete Data
| Radius | 10.705 Earth radii (0.955 Jupiter radii) |
|---|---|
| Mass | 153.83 Earth masses (0.484 Jupiter masses) |
| Density | 0.69 g/cm³ (Earth: 5.51) |
| Orbital period | 5.21 days |
| Orbital distance | 0.060 AU |
| Eccentricity | 0.047 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 2,499.0 light-years (766.2 parsecs) |
| Constellation | Serpens |
| Discovery method | Transit |
| Discovery facility | CoRoT |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2015-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About CoRoT-28 b
Is CoRoT-28 b habitable?
No — CoRoT-28 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is CoRoT-28 b?
CoRoT-28 b is about 2,499 light-years from Earth in the constellation Serpens. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 43,982,400 years to get there.
How big is CoRoT-28 b compared to Earth?
CoRoT-28 b has 10.70 times the radius of Earth and about 154 times its mass.
How long is a year on CoRoT-28 b?
One orbit around CoRoT-28 takes 5.2 Earth days — short enough that 70 of its years would fit into one Earth year.
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