Exoplanet · Neptune-like planet
TOI-4940 b
TOI-4940 b is a Neptune-like planet orbiting the star TOI-4940. Its year lasts 25.9 Earth days. It was discovered in 2025 by the Transit method.
| Host star | TOI-4940 |
|---|---|
| Distance | 1,127 light-years (345.7 pc) |
| Orbital period | 25.9 days |
| Orbital radius | 0.165 AU |
| Radius | 6.61 R⊕ · 0.59 R♃ |
| Mass | 89 M⊕ · 0.28 M♃ |
| Surface gravity | 2.04 × Earth |
| Equilibrium temperature | 643 K (370 °C) |
| Stellar flux received | 40.5 × 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 40.5 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 3.8° across: 7 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.45. Visible from the whole Southern Hemisphere and north to latitude 28° N. South of latitude 28° S it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around the year 899. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 20 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.