TOI-5340 b
TOI-5340 b is a hot Jupiter orbiting TOI-5340 in the constellation Taurus. It lies about 1,737 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5340 b?
TOI-5340 b has a radius of 15.08 times that of Earth, or 1.35 times the radius of Jupiter. Its mass is 270 times that of Earth, giving it a density of 0.43 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5340 b in the Habitable Zone?
TOI-5340 b orbits inside the inner edge of the habitable zone of TOI-5340. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5340: 1.471–3.447 AU (conservative: 1.863–3.268 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-5340 b
The equilibrium temperature of TOI-5340 b is about 1,566 K (1,293 °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 1,004 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5340 b — one full orbit around TOI-5340 — lasts 4.94 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.063 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.13).
How Was TOI-5340 b Discovered?
TOI-5340 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-5340 b?
TOI-5340 b is 1,737.2 light-years (532.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,737 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 30,574,720 years to make the journey.
The Host Star: TOI-5340
TOI-5340
- Surface temperature
- 5,990 K (Sun: 5,772 K)
- Mass
- 1.35 M☉
- Radius
- 1.84 R☉
- Luminosity
- 3.9400 L☉
- Age
- 3.5 billion years (Sun: 4.6)
Planetary System
TOI-5340 b is the only planet known to orbit TOI-5340 so far.
TOI-5340 b — Complete Data
| Radius | 15.076 Earth radii (1.345 Jupiter radii) |
|---|---|
| Mass | 270.15 Earth masses (0.850 Jupiter masses) |
| Density | 0.43 g/cm³ (Earth: 5.51) |
| Orbital period | 4.94 days |
| Orbital distance | 0.063 AU |
| Eccentricity | 0.130 |
| Equilibrium temperature | 1,566 K (1,293 °C) |
| Stellar irradiation | 1,004.00× Earth |
| Distance from Earth | 1,737.2 light-years (532.6 parsecs) |
| Constellation | Taurus |
| 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-5340 b
Is TOI-5340 b habitable?
No — TOI-5340 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5340 b?
TOI-5340 b is about 1,737 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 30,574,720 years to get there.
How big is TOI-5340 b compared to Earth?
TOI-5340 b has 15.08 times the radius of Earth and about 270 times its mass.
How long is a year on TOI-5340 b?
One orbit around TOI-5340 takes 4.9 Earth days — short enough that 74 of its years would fit into one Earth year.
Explore TOI-5340 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.
