Exoplanet · gas giant
TOI-3523 A b
TOI-3523 A b is a gas giant orbiting the star TOI-3523 A. Its year lasts 2.3 Earth days. It was discovered in 2025 by the Transit method.
| Host star | TOI-3523 A |
|---|---|
| Distance | 2,105 light-years (645.3 pc) |
| Orbital period | 2.3 days |
| Orbital radius | 0.0356 AU |
| Eccentricity | 0.047 |
| Radius | 16 R⊕ · 1.42 R♃ |
| Mass | 435 M⊕ · 1.37 M♃ |
| Density | 0.587 g/cm³ |
| Surface gravity | 1.71 × Earth |
| Equilibrium temperature | 1,984 K (1,711 °C) |
| Stellar flux received | 2,590 × Earth |
| Discovery method | Transit |
| Discovery year | 2025 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2,590 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 21° across: 40 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.56. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around 80 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 37 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.