TrES-3b is an extrasolar planet orbiting the star GSC 03089-00929. It has an orbital period of just 31 hours and is undergoing orbital decay due to tidal effects. It has nearly twice the mass of Jupiter.
Size comparison of TrES-3b with Jupiter.
|Discovered by||O'Donovan et al.|
|Discovery site||United States|
|0.0226 ± 0.0013 AU (3,380,000 ± 190,000 km)|
|1.30619 ± 0.00005 d|
|1.341 ± 0.081 RJ|
|Mass||1.92 ± 0.23 MJ|
|1,172 kg/m3 (1,975 lb/cu yd)|
Transits in front of the star GSC 03089-00929 were detected by two 10 cm telescopes operating out of Palomar and Lowell Observatories. Transits of TrES-3 were also independently observed by the Hungarian Automated Telescope Network. Seven high-precision radial velocity measurements were made using the HIRES spectrometer at W. M. Keck Observatory, which confirmed the presence of a planetary mass companion with a minimum mass twice that of the planet Jupiter.
The planet's home star is slightly smaller and cooler than the Sun. The orbital period is less than one and a third days, one of the shortest known.