TOI-7393 b
TOI-7393 b is a hot Jupiter orbiting the M0 V star TOI-7393 in the constellation Draco. It lies about 617 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-7393 b?
TOI-7393 b has a radius of 11.30 times that of Earth, or 1.01 times the radius of Jupiter. Its mass is 195 times that of Earth, giving it a density of 0.74 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-7393 b in the Habitable Zone?
TOI-7393 b orbits inside the inner edge of the habitable zone of TOI-7393. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-7393: 0.227–0.576 AU (conservative: 0.287–0.546 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-7393 b
The equilibrium temperature of TOI-7393 b is about 747 K (474 °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 51.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-7393 b — one full orbit around TOI-7393 — lasts 3.34 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.037 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.12).
How Was TOI-7393 b Discovered?
TOI-7393 b was discovered in 2026 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-7393 b?
TOI-7393 b is 616.6 light-years (189.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1410. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,852,160 years to make the journey.
The Host Star: TOI-7393
TOI-7393
- Spectral type
- M0 V
- Surface temperature
- 3,927 K (Sun: 5,772 K)
- Mass
- 0.60 M☉
- Radius
- 0.58 R☉
- Luminosity
- 0.0780 L☉
Planetary System
TOI-7393 b is the only planet known to orbit TOI-7393 so far.
TOI-7393 b — Complete Data
| Radius | 11.300 Earth radii (1.010 Jupiter radii) |
|---|---|
| Mass | 194.78 Earth masses (0.610 Jupiter masses) |
| Density | 0.74 g/cm³ (Earth: 5.51) |
| Orbital period | 3.34 days |
| Orbital distance | 0.037 AU |
| Eccentricity | 0.120 |
| Equilibrium temperature | 747 K (474 °C) |
| Stellar irradiation | 51.80× Earth |
| Distance from Earth | 616.6 light-years (189.0 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-08-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-7393 b
Is TOI-7393 b habitable?
No — TOI-7393 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-7393 b?
TOI-7393 b is about 617 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,852,160 years to get there.
How big is TOI-7393 b compared to Earth?
TOI-7393 b has 11.30 times the radius of Earth and about 195 times its mass.
How long is a year on TOI-7393 b?
One orbit around TOI-7393 takes 3.3 Earth days — short enough that 109 of its years would fit into one Earth year.
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