Exoplanet · mini-Neptune
TOI-1117 c
TOI-1117 c is a mini-Neptune orbiting the star TOI-1117. Its year lasts 4.58 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | TOI-1117 |
|---|---|
| Distance | 546.6 light-years (167.6 pc) |
| Orbital period | 4.58 days |
| Orbital radius | 0.0534 AU |
| Eccentricity | 0.000 |
| Radius | 2.91 R⊕ · 0.26 R♃ |
| Mass (minimum) | 8.78 M⊕ · 0.0276 M♃ |
| Density | 1.96 g/cm³ |
| Equilibrium temperature | 1,210 K (937 °C) |
| Stellar flux received | 355 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 355 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 11.02. Visible from the whole Southern Hemisphere and north to latitude 24° N. South of latitude 24° S it never sets. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1479. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.7 million years.
Planets in the same system
- TOI-1117 b 2.23-day orbit · 2.46 R⊕
- TOI-1117 d 8.67-day orbit · 3.27 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.