Exoplanet · mini-Neptune
HIP 41378 d
HIP 41378 d is a mini-Neptune orbiting the star HIP 41378. Its year lasts 278 Earth days. It was discovered in 2016 by the Transit method.
| Host star | HIP 41378 |
|---|---|
| Distance | 346.7 light-years (106.3 pc) |
| Orbital period | 278 days |
| Orbital radius | 1.17 AU |
| Eccentricity | 0.063 |
| Radius | 3.65 R⊕ · 0.326 R♃ |
| Mass | 6.53 M⊕ · 0.0205 M♃ |
| Density | 0.74 g/cm³ |
| Surface gravity | 0.49 × Earth |
| Equilibrium temperature | 367 K (94 °C) |
| Stellar flux received | 3.01 × Earth |
| Discovery method | Transit |
| Discovery year | 2016 |
| Discovered by | K2 |
Habitable zone
Inside the inner edge of the habitable zone: it receives 3.01 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 0.59° across: 1.1 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.93); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 80° S. North of latitude 80° N it never sets. It stands highest at midnight in January, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1679. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.1 million years.
Planets in the same system
- HIP 41378 b 15.6-day orbit · 2.64 R⊕
- HIP 41378 c 31.7-day orbit · 2.74 R⊕
- HIP 41378 e 393-day orbit · 5.19 R⊕
- HIP 41378 f 542-day orbit · 9.47 R⊕
- HIP 41378 g 63.2-day orbit · 2.5 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.