Exoplanet · Neptune-like planet
GJ 328 c
GJ 328 c is a Neptune-like planet orbiting the star GJ 328. Its year lasts 242 Earth days. It was discovered in 2023 by the Radial Velocity method.
| Host star | GJ 328 |
|---|---|
| Distance | 66.9 light-years (20.5 pc) |
| Orbital period | 242 days |
| Orbital radius | 0.657 AU |
| Radius | 4.91 R⊕ · 0.438 R♃ |
| Mass (minimum) | 21.4 M⊕ · 0.0673 M♃ |
| Density | 0.993 g/cm³ |
| Equilibrium temperature | 184 K (-89 °C) |
| Stellar flux received | 0.193 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2023 |
| Discovered by | Roque de los Muchachos Observatory |
Habitable zone
Beyond the habitable zone: it receives only %19 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.51° across: 0.96 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 9.99. Visible from the whole Northern Hemisphere and south to latitude 88° S. It stands highest at midnight in February, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1959. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
Planets in the same system
- GJ 328 b 3,770-day orbit · 13.3 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.