Exoplanet · Neptune-like planet
Kepler-858 b
Kepler-858 b is a Neptune-like planet orbiting the star Kepler-858. Its year lasts 76.1 Earth days. It was discovered in 2016 by the Transit method.
| Host star | Kepler-858 |
|---|---|
| Distance | 973.7 light-years (298.5 pc) |
| Orbital period | 76.1 days |
| Orbital radius | 0.339 AU |
| Eccentricity | 0.000 |
| Radius | 4.87 R⊕ · 0.434 R♃ |
| Mass | 21.1 M⊕ · 0.0664 M♃ (estimated from the radius) |
| Density | 1 g/cm³ |
| Equilibrium temperature | 399 K (126 °C) |
| Stellar flux received | 6.34 × Earth |
| Discovery method | Transit |
| Discovery year | 2016 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 6.34 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 1.4° across: 2.7 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.57. Visible from the whole Northern Hemisphere and south to latitude 39° S. North of latitude 39° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1052. 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.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.