Exoplanet · mini-Neptune
pi Men d
pi Men d is a mini-Neptune orbiting the star HD 39091. Its year lasts 125 Earth days. It was discovered in 2022 by the Radial Velocity method.
| Host star | HD 39091 |
|---|---|
| Distance | 59.6 light-years (18.3 pc) |
| Orbital period | 125 days |
| Orbital radius | 0.506 AU |
| Eccentricity | 0.220 |
| Radius | 3.72 R⊕ · 0.332 R♃ |
| Mass (minimum) | 13.4 M⊕ · 0.0421 M♃ |
| Density | 1.43 g/cm³ |
| Equilibrium temperature | 444 K (170 °C) |
| Stellar flux received | 5.64 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2022 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 5.64 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 1.3° across: 2.4 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.65). Visible from the whole Southern Hemisphere and north to latitude 10° N. South of latitude 10° S it never sets.
Light's journey
The light you see tonight set out around the year 1966. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
Planets in the same system
- pi Men c 6.27-day orbit · 2.02 R⊕
- HD 39091 b 2,090-day orbit · 12.3 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.