TOI-3593 b
TOI-3593 b is a hot Jupiter orbiting TOI-3593 in the constellation Pegasus. It lies about 739 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-3593 b?
TOI-3593 b has a radius of 11.03 times that of Earth, or 0.98 times the radius of Jupiter. Its mass is 566 times that of Earth, giving it a density of 2.31 g/cm³ — between that of rocky and gaseous planets.
Is TOI-3593 b in the Habitable Zone?
TOI-3593 b orbits inside the inner edge of the habitable zone of TOI-3593. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3593: 0.646–1.533 AU (conservative: 0.819–1.453 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-3593 b
The equilibrium temperature of TOI-3593 b is about 1,170 K (897 °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 308 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-3593 b — one full orbit around TOI-3593 — lasts 3.82 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.11).
How Was TOI-3593 b Discovered?
TOI-3593 b was discovered in 2025 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-3593 b?
TOI-3593 b is 739.2 light-years (226.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1287. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,009,920 years to make the journey.
The Host Star: TOI-3593
TOI-3593
- Surface temperature
- 5,550 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 0.92 R☉
- Luminosity
- 0.7220 L☉
- Age
- 1.8 billion years (Sun: 4.6)
Planetary System
TOI-3593 b is the only planet known to orbit TOI-3593 so far.
TOI-3593 b — Complete Data
| Radius | 11.030 Earth radii (0.984 Jupiter radii) |
|---|---|
| Mass | 565.73 Earth masses (1.780 Jupiter masses) |
| Density | 2.31 g/cm³ (Earth: 5.51) |
| Orbital period | 3.82 days |
| Orbital distance | 0.048 AU |
| Eccentricity | 0.105 |
| Equilibrium temperature | 1,170 K (897 °C) |
| Stellar irradiation | 308.00× Earth |
| Distance from Earth | 739.2 light-years (226.6 parsecs) |
| Constellation | Pegasus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3593 b
Is TOI-3593 b habitable?
No — TOI-3593 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3593 b?
TOI-3593 b is about 739 light-years from Earth in the constellation Pegasus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,009,920 years to get there.
How big is TOI-3593 b compared to Earth?
TOI-3593 b has 11.03 times the radius of Earth and about 566 times its mass.
How long is a year on TOI-3593 b?
One orbit around TOI-3593 takes 3.8 Earth days — short enough that 96 of its years would fit into one Earth year.
Explore TOI-3593 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
