Exoplanet
Nicknamed 'Osiris,' the first exoplanet observed transiting its star and the first found to have an atmosphere.
| Type | Exoplanet |
|---|---|
| Orbits | HD 209458 |
| Distance from Earth | 159 ly |
| Diameter | 193,000 km |
| Mass | 1.39 × 10^27 kg |
| Temperature | 1,186°C |
| Orbital period | 4 days |
| Apparent magnitude | 7.65 |
| Hemisphere | Northern |
| Discovered | 1999 |