 Size comparison of TrES-3b with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | O'Donovan et al. |
| Discovery site | United States |
| Discovery date | 2007 |
| Transit | |
| Orbital characteristics | |
| 0.0226 ± 0.0013 AU (3,380,000 ± 190,000 km) | |
| 1.30619 ± 0.00005d | |
| Inclination | 82.15 |
| Star | GSC 03089-00929 |
| Physical characteristics | |
| 1.341 ± 0.081RJ | |
| Mass | 1.92 ± 0.23MJ |
Meandensity | 1.172 g/cm3 |
| 2.7g | |
| Temperature | 1555K[1] |
TrES-3b is anextrasolar planet orbiting the starGSC 03089-00929. It has an orbital period of just 31 hours and nearly twice the mass ofJupiter.
The planet TrES-3b is namedUmbäässa. The name was selected in theNameExoWorlds campaign byLiechtenstein, during the 100th anniversary of theIAU. In the local dialect of southern Liechtenstein, Umbäässa is a small and barely visibleant.[2][3]
It is the thirdtransitingplanet found by theTrans-Atlantic Exoplanet Survey. It was discovered in the constellationHercules about 10 degrees west ofVega, the brightest star in the summer skies.
Transits in front of the star GSC 03089-00929 were detected by two 10 cm telescopes operating out ofPalomar andLowell Observatories. Transits of TrES-3 were also independently observed by theHungarian Automated Telescope Network. Seven high-precisionradial velocity measurements were made using the HIRES spectrometer atW. M. Keck Observatory, which confirmed the presence of a planetary mass companion with a minimum mass twice that of the planetJupiter.[4]
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.[4] Despite close proximity to the star, no evidence of tidal-driven orbital decay was present as in 2020, with best data fit indicating only an apsidal precession of planetary orbit.[5]
Media related toTrES-3 at Wikimedia Commons
