Exoplanet · Neptune-like planet
TOI-5599 b
TOI-5599 b is a Neptune-like planet orbiting the star TOI-5599. Its year lasts 5.44 Earth days. It was discovered in 2026 by the Transit method.
| Host star | TOI-5599 |
|---|---|
| Distance | 1,787 light-years (547.9 pc) |
| Orbital period | 5.44 days |
| Radius | 7.19 R⊕ · 0.641 R♃ |
| Mass | 40.9 M⊕ · 0.129 M♃ (estimated from the radius) |
| Density | 0.605 g/cm³ |
| Equilibrium temperature | 1,496 K (1,223 °C) |
| Stellar flux received | 833 × Earth |
| Discovery method | Transit |
| Discovery year | 2026 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 833 times the light the Earth does, too hot to keep liquid water on its surface.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.51. Visible from the whole Northern Hemisphere and south to latitude 34° S. North of latitude 34° N it never sets. It stands highest at midnight in April, the best time to observe it.
Light's journey
The light you see tonight set out around the year 239. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 32 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.