TOI-7394 B b
TOI-7394 B b is a hot Jupiter orbiting the M1 V star TOI-7394 B in the constellation Draco. It lies about 620 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-7394 B b?
TOI-7394 B b has a radius of 11.50 times that of Earth, or 1.02 times the radius of Jupiter. Its mass is 669 times that of Earth, giving it a density of 2.44 g/cm³ — between that of rocky and gaseous planets.
Is TOI-7394 B b in the Habitable Zone?
TOI-7394 B b orbits inside the inner edge of the habitable zone of TOI-7394 B. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-7394 B: 0.213–0.546 AU (conservative: 0.269–0.518 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-7394 B b
The equilibrium temperature of TOI-7394 B b is about 986 K (713 °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 157 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-7394 B b — one full orbit around TOI-7394 B — lasts just 30.1 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.019 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.027).
How Was TOI-7394 B b Discovered?
TOI-7394 B 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-7394 B b?
TOI-7394 B b is 619.7 light-years (190.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1407. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,906,720 years to make the journey.
The Host Star: TOI-7394 B
TOI-7394 B b belongs to a system of 2 stars; it orbits TOI-7394 B.
TOI-7394 B
- Spectral type
- M1 V
- Surface temperature
- 3,717 K (Sun: 5,772 K)
- Mass
- 0.62 M☉
- Radius
- 0.61 R☉
- Luminosity
- 0.0680 L☉
Planetary System
TOI-7394 B b is the only planet known to orbit TOI-7394 B so far.
TOI-7394 B b — Complete Data
| Radius | 11.500 Earth radii (1.020 Jupiter radii) |
|---|---|
| Mass | 668.74 Earth masses (2.100 Jupiter masses) |
| Density | 2.44 g/cm³ (Earth: 5.51) |
| Orbital period | 1.25 days |
| Orbital distance | 0.019 AU |
| Eccentricity | 0.027 |
| Equilibrium temperature | 986 K (713 °C) |
| Stellar irradiation | 156.70× Earth |
| Distance from Earth | 619.7 light-years (190.0 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-7394 B b
Is TOI-7394 B b habitable?
No — TOI-7394 B b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-7394 B b?
TOI-7394 B b is about 620 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,906,720 years to get there.
How big is TOI-7394 B b compared to Earth?
TOI-7394 B b has 11.50 times the radius of Earth and about 669 times its mass.
How long is a year on TOI-7394 B b?
One orbit around TOI-7394 B takes 1.3 Earth days — short enough that 292 of its years would fit into one Earth year.
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