Exoplanet · gas giant
GJ 9773 b
GJ 9773 b is a gas giant orbiting the star GJ 9773. Its year lasts 2,970 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | GJ 9773 |
|---|---|
| Distance | 51.9 light-years (15.9 pc) |
| Orbital period | 8.12 years |
| Orbital radius | 2.92 AU |
| Eccentricity | 0.218 |
| Radius | 14.2 R⊕ · 1.27 R♃ |
| Mass (minimum) | 173 M⊕ · 0.543 M♃ |
| Density | 0.331 g/cm³ |
| Equilibrium temperature | 60 K (-213 °C) |
| Stellar flux received | 0.0021 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | Calar Alto Observatory |
Habitable zone
Beyond the habitable zone: it receives only %0.21 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.066° across: 0.12 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.99. Visible from the whole Northern Hemisphere and south to latitude 81° S. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1974. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 921 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.