Exoplanet · gas giant
TOI-3856 b
TOI-3856 b is a gas giant orbiting the star TOI-3856. Its year lasts 2.04 Earth days. It was discovered in 2025 by the Transit method.
| Host star | TOI-3856 |
|---|---|
| Distance | 1,026 light-years (314.4 pc) |
| Orbital period | 2.04 days |
| Orbital radius | 0.0325 AU |
| Eccentricity | 0.083 |
| Radius | 13.6 R⊕ · 1.21 R♃ |
| Mass | 172 M⊕ · 0.54 M♃ |
| Density | 0.371 g/cm³ |
| Surface gravity | 0.928 × Earth |
| Equilibrium temperature | 1,544 K (1,271 °C) |
| Stellar flux received | 949 × Earth |
| Discovery method | Transit |
| Discovery year | 2025 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 949 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 17° across: 32 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.29. Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° N it never sets. It stands highest at midnight in February, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1000. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 18 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.