Exoplanet · mini-Neptune
HD 86728 b
HD 86728 b is a mini-Neptune orbiting the star HD 86728. Its year lasts 31.2 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | HD 86728 |
|---|---|
| Distance | 48.7 light-years (14.9 pc) |
| Orbital period | 31.2 days |
| Orbital radius | 0.192 AU |
| Eccentricity | 0.067 |
| Radius | 3.03 R⊕ · 0.27 R♃ |
| Mass (minimum) | 9.43 M⊕ · 0.0297 M♃ |
| Density | 1.86 g/cm³ |
| Equilibrium temperature | 687 K (414 °C) |
| Stellar flux received | 37.2 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 37.2 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 3.4° across: 6.5 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.37). Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° N it never sets. It stands highest at midnight in February, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1977. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 863 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.