Exoplanet · mini-Neptune
HD 158259 d
HD 158259 d is a mini-Neptune orbiting the star HD 158259. Its year lasts 5.2 Earth days. It was discovered in 2020 by the Radial Velocity method.
| Host star | HD 158259 |
|---|---|
| Distance | 88.2 light-years (27.0 pc) |
| Orbital period | 5.2 days |
| Radius | 2.18 R⊕ · 0.194 R♃ |
| Mass (minimum) | 5.41 M⊕ · 0.017 M♃ |
| Density | 2.87 g/cm³ |
| Discovery method | Radial Velocity |
| Discovery year | 2020 |
| Discovered by | Haute-Provence Observatory |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.46). Visible from the whole Northern Hemisphere and south to latitude 37° S. North of latitude 37° N it never sets. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1938. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.6 million years.
Planets in the same system
- HD 158259 b 2.18-day orbit · 1.28 R⊕
- HD 158259 c 3.43-day orbit · 2.23 R⊕
- HD 158259 e 7.95-day orbit · 2.34 R⊕
- HD 158259 f 12-day orbit · 2.35 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.