TOI-5153 b
TOI-5153 b is a cold gas giant orbiting the F8 V star TOI-5153 in the constellation Lepus. It lies about 1,274 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-5153 b?
TOI-5153 b has a radius of 11.88 times that of Earth, or 1.06 times the radius of Jupiter. Its mass is 1,036 times that of Earth.
Is TOI-5153 b in the Habitable Zone?
TOI-5153 b orbits inside the inner edge of the habitable zone of TOI-5153. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5153: 1.210–2.818 AU (conservative: 1.533–2.672 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5153 b
The equilibrium temperature of TOI-5153 b is about 906 K (633 °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-5153 b — one full orbit around TOI-5153 — lasts 20.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.158 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-5153 b Discovered?
TOI-5153 b was discovered in 2022 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-5153 b?
TOI-5153 b is 1,273.6 light-years (390.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,274 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,415,360 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. TOI-5153 b scores 0.08, ranking #4,607 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-5153
TOI-5153
- Spectral type
- F8 V
- Surface temperature
- 6,300 K (Sun: 5,772 K)
- Mass
- 1.24 M☉
- Radius
- 1.40 R☉
- Age
- 5.4 billion years (Sun: 4.6)
Planetary System
TOI-5153 b is the only planet known to orbit TOI-5153 so far.
TOI-5153 b — Complete Data
| Radius | 11.882 Earth radii (1.060 Jupiter radii) |
|---|---|
| Mass | 1,036.12 Earth masses (3.260 Jupiter masses) |
| Orbital period | 20.33 days |
| Orbital distance | 0.158 AU |
| Eccentricity | 0.091 |
| Equilibrium temperature | 906 K (633 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,273.6 light-years (390.5 parsecs) |
| Constellation | Lepus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5153 b
Is TOI-5153 b habitable?
No — TOI-5153 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5153 b?
TOI-5153 b is about 1,274 light-years from Earth in the constellation Lepus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,415,360 years to get there.
How big is TOI-5153 b compared to Earth?
TOI-5153 b has 11.88 times the radius of Earth and about 1,036 times its mass.
How long is a year on TOI-5153 b?
One orbit around TOI-5153 takes 20.3 Earth days — short enough that 18 of its years would fit into one Earth year.
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