Exoplanet · gas giant
Gaia-4 b
Gaia-4 b is a gas giant orbiting the star Gaia-4. Its year lasts 571 Earth days. It was discovered in 2025 by the Astrometry method.
| Host star | Gaia-4 |
|---|---|
| Distance | 239.7 light-years (73.5 pc) |
| Orbital period | 571 days |
| Eccentricity | 0.338 |
| Radius | 12.4 R⊕ · 1.11 R♃ |
| Mass | 3,750 M⊕ · 11.8 M♃ |
| Density | 10.8 g/cm³ |
| Surface gravity | 24.4 × Earth |
| Discovery method | Astrometry |
| Discovery year | 2025 |
| Discovered by | European Space Agency (ESA) Gaia Satellite |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.46. Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° N it never sets. It stands highest at midnight in April, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1786. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.3 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.