TOI-5293 A b
TOI-5293 A b is a hot Jupiter orbiting the M3+/-1 star TOI-5293 A in the constellation Pisces. It lies about 529 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-5293 A b?
TOI-5293 A b has a radius of 11.90 times that of Earth, or 1.06 times the radius of Jupiter. Its mass is 170 times that of Earth, giving it a density of 0.56 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5293 A b in the Habitable Zone?
TOI-5293 A b orbits inside the inner edge of the habitable zone of TOI-5293 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5293 A: 0.164–0.423 AU (conservative: 0.207–0.401 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 ›
Temperature on TOI-5293 A b
The equilibrium temperature of TOI-5293 A b is about 675 K (402 °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. It receives 34.60 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5293 A b — one full orbit around TOI-5293 A — lasts 2.93 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.034 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.38), swinging dramatically closer to and farther from its star.
How Was TOI-5293 A b Discovered?
TOI-5293 A b was discovered in 2023 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-5293 A b?
TOI-5293 A b is 529.1 light-years (162.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1497. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,312,160 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-5293 A b scores 0.10, ranking #4,431 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-5293 A
TOI-5293 A b belongs to a system of 2 stars; it orbits TOI-5293 A.
TOI-5293 A
- Spectral type
- M3+/-1
- Surface temperature
- 3,586 K (Sun: 5,772 K)
- Mass
- 0.54 M☉
- Radius
- 0.52 R☉
- Age
- 2.9 billion years (Sun: 4.6)
Planetary System
TOI-5293 A b is the only planet known to orbit TOI-5293 A so far.
TOI-5293 A b — Complete Data
| Radius | 11.900 Earth radii (1.060 Jupiter radii) |
|---|---|
| Mass | 170.40 Earth masses (0.540 Jupiter masses) |
| Density | 0.56 g/cm³ (Earth: 5.51) |
| Orbital period | 2.93 days |
| Orbital distance | 0.034 AU |
| Eccentricity | 0.380 |
| Equilibrium temperature | 675 K (402 °C) |
| Stellar irradiation | 34.60× Earth |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 529.1 light-years (162.2 parsecs) |
| Constellation | Pisces |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-07-21. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5293 A b
Is TOI-5293 A b habitable?
No — TOI-5293 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5293 A b?
TOI-5293 A b is about 529 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,312,160 years to get there.
How big is TOI-5293 A b compared to Earth?
TOI-5293 A b has 11.90 times the radius of Earth and about 170 times its mass.
How long is a year on TOI-5293 A b?
One orbit around TOI-5293 A takes 2.9 Earth days — short enough that 125 of its years would fit into one Earth year.
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