Exoplanet · mini-Neptune
HIP 4845 b
HIP 4845 b is a mini-Neptune orbiting the star HIP 4845. Its year lasts 34.2 Earth days. It was discovered in 2020 by the Radial Velocity method.
| Host star | HIP 4845 |
|---|---|
| Distance | 68.8 light-years (21.1 pc) |
| Orbital period | 34.2 days |
| Orbital radius | 0.176 AU |
| Eccentricity | 0.250 |
| Radius | 3.89 R⊕ · 0.347 R♃ |
| Mass (minimum) | 14.4 M⊕ · 0.0453 M♃ |
| Density | 1.34 g/cm³ |
| Equilibrium temperature | 358 K (85 °C) |
| Stellar flux received | 2.99 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2020 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2.99 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 1.8° across: 3.4 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.06. Visible from the whole Southern Hemisphere and north to latitude 80° N. South of latitude 80° S it never sets. It stands highest at midnight in October, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1957. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.