Exoplanet · Neptune-like planet
GJ 687 c
GJ 687 c is a Neptune-like planet orbiting the star GJ 687. Its year lasts 728 Earth days. It was discovered in 2020 by the Radial Velocity method.
| Host star | GJ 687 |
|---|---|
| Distance | 14.8 light-years (4.55 pc) |
| Orbital period | 728 days |
| Orbital radius | 1.17 AU |
| Eccentricity | 0.400 |
| Radius | 4.14 R⊕ · 0.369 R♃ |
| Mass (minimum) | 16 M⊕ · 0.0503 M♃ |
| Density | 1.24 g/cm³ |
| Equilibrium temperature | 99 K (-175 °C) |
| Stellar flux received | 0.0157 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2020 |
| Discovered by | Multiple Observatories |
Habitable zone
Beyond the habitable zone: it receives only %1.6 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.19° across: 0.36 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 9.15. Visible from the whole Northern Hemisphere and south to latitude 22° S. North of latitude 22° N it never sets. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2011. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 263 thousand years.
Planets in the same system
- GJ 687 b 38.1-day orbit · 4.32 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.