HD 209458 b

HD 209458 b is an exoplanet. It orbits HD 209458 in the constellation Pegasus. It is approximately 159 light years from the Solar System. A year on HD 209458 b is 3.5 Earth days. It has an estimated surface temperature of about 1,000 °C (about 1,800 °F). Its mass is 220 times that of Earth.

It is the first exoplanet to be discovered with the transit method. Also this the first exoplanet to be discovered to have an atmosphere. The atmosphere contains water vapor, carbon monoxide, hydrogen cyanide, methane, ammonia and acetylene.

The exoplanet does have a magnetic field, but the magnetic field was about one tenth as strong as Jupiter's

References

Category:Exoplanets