Exoplanet · Neptune-like planet
GJ 15 A c
GJ 15 A c is a Neptune-like planet orbiting the star Groombridge 34. Its year lasts 7,600 Earth days. It was discovered in 2018 by the Radial Velocity method.
| Host star | Groombridge 34 |
|---|---|
| Distance | 11.6 light-years (3.56 pc) |
| Orbital period | 20.8 years |
| Orbital radius | 5.4 AU |
| Eccentricity | 0.270 |
| Radius | 6.67 R⊕ · 0.595 R♃ |
| Mass (minimum) | 36 M⊕ · 0.113 M♃ |
| Density | 0.667 g/cm³ |
| Equilibrium temperature | 46 K (-227 °C) |
| Stellar flux received | 8.00 × 10⁻⁴ × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2018 |
| Discovered by | Roque de los Muchachos Observatory |
Habitable zone
Beyond the habitable zone: it receives only %0.08 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.038° across: 0.07 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.09); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 46° S. North of latitude 46° N it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2014. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 206 thousand years.
Planets in the same system
- GJ 15 A b 11.4-day orbit · 1.55 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.