Exoplanet · mini-Neptune
HD 285968 b
HD 285968 b is a mini-Neptune orbiting the star HD 285968. Its year lasts 8.78 Earth days. It was discovered in 2008 by the Radial Velocity method.
| Host star | HD 285968 |
|---|---|
| Distance | 30.9 light-years (9.47 pc) |
| Orbital period | 8.78 days |
| Orbital radius | 0.066 AU |
| Eccentricity | 0.000 |
| Radius | 2.83 R⊕ · 0.252 R♃ |
| Mass (minimum) | 8.4 M⊕ · 0.0264 M♃ |
| Density | 2.04 g/cm³ |
| Equilibrium temperature | 450 K (177 °C) |
| Stellar flux received | 5.05 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2008 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 5.05 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 3.9° across: 7.2 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 9.95. Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° N it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1995. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 548 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.