TOI-3894 b
TOI-3894 b is a hot Jupiter orbiting TOI-3894 in the constellation Ursa Major. It lies about 1,361 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-3894 b?
TOI-3894 b has a radius of 15.28 times that of Earth, or 1.36 times the radius of Jupiter. Its mass is 261 times that of Earth, giving it a density of 0.40 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-3894 b in the Habitable Zone?
TOI-3894 b orbits inside the inner edge of the habitable zone of TOI-3894. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3894: 1.199–2.810 AU (conservative: 1.519–2.664 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3894 b
The equilibrium temperature of TOI-3894 b is about 1,531 K (1,258 °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.
Orbit and Year Length
A year on TOI-3894 b — one full orbit around TOI-3894 — lasts 4.33 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.054 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.05).
How Was TOI-3894 b Discovered?
TOI-3894 b was discovered in 2024 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-3894 b?
TOI-3894 b is 1,361.3 light-years (417.4 parsecs) from Earth. Light arriving here tonight left the planet about 1,361 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 23,958,880 years to make the journey.
The Host Star: TOI-3894
TOI-3894
- Surface temperature
- 6,000 K (Sun: 5,772 K)
- Mass
- 1.14 M☉
- Radius
- 1.50 R☉
- Luminosity
- 2.6240 L☉
- Age
- 5.7 billion years (Sun: 4.6)
Planetary System
TOI-3894 b is the only planet known to orbit TOI-3894 so far.
TOI-3894 b — Complete Data
| Radius | 15.278 Earth radii (1.363 Jupiter radii) |
|---|---|
| Mass | 260.62 Earth masses (0.820 Jupiter masses) |
| Density | 0.40 g/cm³ (Earth: 5.51) |
| Orbital period | 4.33 days |
| Orbital distance | 0.054 AU |
| Eccentricity | 0.050 |
| Equilibrium temperature | 1,531 K (1,258 °C) |
| Distance from Earth | 1,361.3 light-years (417.4 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3894 b
Is TOI-3894 b habitable?
No — TOI-3894 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3894 b?
TOI-3894 b is about 1,361 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 23,958,880 years to get there.
How big is TOI-3894 b compared to Earth?
TOI-3894 b has 15.28 times the radius of Earth and about 261 times its mass.
How long is a year on TOI-3894 b?
One orbit around TOI-3894 takes 4.3 Earth days — short enough that 84 of its years would fit into one Earth year.
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