TOI-757 b
TOI-757 b is a super-Earth orbiting the K0 V star TOI-757 in the constellation Centaurus. It lies about 197 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-757 b?
TOI-757 b has a radius of 2.50 times that of Earth. Its mass is 10.5 times that of Earth, giving it a density of 3.60 g/cm³ — between that of rocky and gaseous planets.
Is TOI-757 b in the Habitable Zone?
TOI-757 b orbits inside the inner edge of the habitable zone of TOI-757. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-757: 0.501–1.198 AU (conservative: 0.634–1.135 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-757 b
The equilibrium temperature of TOI-757 b is about 641 K (368 °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 TOI-757 b — one full orbit around TOI-757 — lasts 17.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.122 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.39), swinging dramatically closer to and farther from its star.
How Was TOI-757 b Discovered?
TOI-757 b was discovered in 2024 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
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 TOI-757 b?
TOI-757 b is 196.8 light-years (60.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1830. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,463,680 years to make the journey.
The Host Star: TOI-757
TOI-757
- Spectral type
- K0 V
- Surface temperature
- 5,278 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.78 R☉
- Luminosity
- 0.4200 L☉
- Age
- 7.5 billion years (Sun: 4.6)
Planetary System
TOI-757 b is the only planet known to orbit TOI-757 so far.
TOI-757 b — Complete Data
| Radius | 2.500 Earth radii (0.223 Jupiter radii) |
|---|---|
| Mass | 10.50 Earth masses (0.033 Jupiter masses) |
| Density | 3.60 g/cm³ (Earth: 5.51) |
| Orbital period | 17.47 days |
| Orbital distance | 0.122 AU |
| Eccentricity | 0.390 |
| Equilibrium temperature | 641 K (368 °C) |
| Distance from Earth | 196.8 light-years (60.3 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-757 b
Is TOI-757 b habitable?
No — TOI-757 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-757 b?
TOI-757 b is about 197 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,463,680 years to get there.
How big is TOI-757 b compared to Earth?
TOI-757 b has 2.50 times the radius of Earth and about 10.5 times its mass.
How long is a year on TOI-757 b?
One orbit around TOI-757 takes 17.5 Earth days — short enough that 21 of its years would fit into one Earth year.
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