Exoplanet · Neptune-like planet
K2-157 d
K2-157 d is a Neptune-like planet orbiting the star K2-157. Its year lasts 66.5 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | K2-157 |
|---|---|
| Distance | 973.2 light-years (298.4 pc) |
| Orbital period | 66.5 days |
| Orbital radius | 0.309 AU |
| Eccentricity | 0.500 |
| Radius | 5.16 R⊕ · 0.46 R♃ |
| Mass (minimum) | 23.3 M⊕ · 0.0733 M♃ |
| Density | 0.932 g/cm³ |
| Equilibrium temperature | 429 K (156 °C) |
| Stellar flux received | 6.46 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | Paranal Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 6.46 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 1.5° across: 2.8 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.94. Visible from the whole Southern Hemisphere and north to latitude 84° N. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1053. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 17 million years.
Planets in the same system
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.