Exoplanet · mini-Neptune
HIP 54373 b
HIP 54373 b is a mini-Neptune orbiting the star HIP 54373. Its year lasts 7.76 Earth days. It was discovered in 2019 by the Radial Velocity method.
| Host star | HIP 54373 |
|---|---|
| Distance | 61.0 light-years (18.7 pc) |
| Orbital period | 7.76 days |
| Orbital radius | 0.063 AU |
| Eccentricity | 0.200 |
| Radius | 2.87 R⊕ · 0.256 R♃ |
| Mass (minimum) | 8.62 M⊕ · 0.0271 M♃ |
| Density | 2 g/cm³ |
| Equilibrium temperature | 581 K (308 °C) |
| Stellar flux received | 15.1 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2019 |
| Discovered by | Las Campanas Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 15.1 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 4.8° across: 9 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.38. Visible from the whole Southern Hemisphere and north to latitude 71° N. South of latitude 71° S it never sets. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1965. 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
- HIP 54373 c 15.1-day orbit · 3.57 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.