SpazeHot Jupiter, 158 light years away, HD 209458
HD 209458 b
The first exoplanet seen passing in front of its star, and the first with an atmosphere detected.
- Distance
- 158 light years
- Year
- 3.5 days
- Size
- 1.4 × Jupiter
- Temperature
- 1,186 °C
- Mass
- 232 × Earth
- Found
- 1999, W. M. Keck Observatory
Can we live on HD 209458 b?
Air: H₂, He. Not breathable: you’d need a suit and your own oxygen.
Gravity: 0.96 g. Someone who weighs 70 kg on Earth would weigh 67 kg there.
Temperature: 1,186 °C on average.
Clouds: Hydrogen boiling off into a comet-like tail.
Atmosphere
- H₂
- He
- Na
- H₂O
- CO
- H (escaping)
Measured by Hubble, JWST