Exoplanet · Neptune-like planet
TOI-5646 b
TOI-5646 b is a Neptune-like planet orbiting the star TOI-5646. Its year lasts 2.43 Earth days. It was discovered in 2026 by the Transit method.
| Host star | TOI-5646 |
|---|---|
| Distance | 1,400 light-years (429.2 pc) |
| Orbital period | 2.43 days |
| Orbital radius | 0.0427 AU |
| Eccentricity | 0.120 |
| Radius | 6.61 R⊕ · 0.59 R♃ |
| Mass | 45.9 M⊕ · 0.145 M♃ |
| Density | 0.87 g/cm³ |
| Surface gravity | 1.05 × Earth |
| Equilibrium temperature | 1,935 K (1,662 °C) |
| Stellar flux received | 2,340 × 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 2,340 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 23° across: 42 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.49. Visible from the whole Northern Hemisphere and south to latitude 84° S. 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 626. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 25 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.