Exoplanet · mini-Neptune
Kepler-1684 b
Kepler-1684 b is a mini-Neptune orbiting the star Kepler-1684. Its year lasts 47.7 Earth days. It was discovered in 2020 by the Transit method.
| Host star | Kepler-1684 |
|---|---|
| Distance | 2,029 light-years (622.0 pc) |
| Orbital period | 47.7 days |
| Orbital radius | 0.225 AU |
| Eccentricity | 0.000 |
| Radius | 2.87 R⊕ · 0.256 R♃ |
| Mass | 8.6 M⊕ · 0.0271 M♃ (estimated from the radius) |
| Density | 2 g/cm³ |
| Equilibrium temperature | 347 K (74 °C) |
| Stellar flux received | 3.42 × Earth |
| Discovery method | Transit |
| Discovery year | 2020 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 3.42 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 1.6° across: 3 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 15.95. Visible from the whole Northern Hemisphere and south to latitude 44° S. North of latitude 44° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around 4 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 36 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.