HD 209458 b

HD 209458 b is a transiting hot Jupiter orbiting a G-type star (1.15 solar masses) in a 3.5-day orbit. The planet was discovered in 1999 by the radial velocity method, by two groups, and transit and direct imaging observations have been successful, making it of interest for further study. Planet characteristics:

• Discovery: by the radial velocity method in 1999.
• Host star: HD 209458.
• Pegasus - constellation.
• 20h03m10.77275s - right ascension.
• +18deg53m03.5494s - declination.
• 157 ly - distance.
• 0.047 AU - orbital radius (semi-major axis).
• 3.5 days - orbital period.
• 1.36 - radius in Jupiter radii.
• 0.68 - Jupiter masses.
• 1300 K - estimated surface temperature.