Exoplanet · mini-Neptune
TIC 434398831 b
TIC 434398831 b is a mini-Neptune orbiting the star TIC 434398831. Its year lasts 3.69 Earth days. It was discovered in 2025 by the Transit method.
| Host star | TIC 434398831 |
|---|---|
| Distance | 707.8 light-years (217.0 pc) |
| Orbital period | 3.69 days |
| Orbital radius | 0.0464 AU |
| Eccentricity | 0.040 |
| Radius | 3.51 R⊕ · 0.313 R♃ |
| Mass | 12.1 M⊕ · 0.0381 M♃ (estimated from the radius) |
| Density | 1.54 g/cm³ |
| Equilibrium temperature | 1,250 K (977 °C) |
| Stellar flux received | 334 × 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 334 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 10° across: 20 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.77. Visible from the whole Northern Hemisphere and south to latitude 74° S. North of latitude 74° N it never sets. It stands highest at midnight in December, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1318. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
Planets in the same system
- TIC 434398831 c 6.21-day orbit · 5.63 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.