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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.

Exoplanet Comparison TrES-3 b.png
Size comparison of TrES-3b with Jupiter.
Discovered byO'Donovan et al.
Discovery siteUnited States
Discovery date2007
Orbital characteristics
0.0226 ± 0.0013 AU (3,380,000 ± 190,000 km)
1.30619 ± 0.00005 d
StarGSC 03089-00929
Physical characteristics
Mean radius
1.341 ± 0.081 RJ
Mass1.92 ± 0.23 MJ
Mean density
1,172 kg/m3 (1,975 lb/cu yd)
2.7 g
The radial velocity trend of the star that hosts TrES-3.


It is the third transiting planet found by the Trans-Atlantic Exoplanet Survey. It was discovered in the constellation Hercules about 10 degrees west of Vega, 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 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.[1]


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.[1]

See alsoEdit


  1. ^ a b O'Donovan, Francis T.; et al. (2007). "TrES-3: A Nearby, Massive, Transiting Hot Jupiter in a 31-Hour Orbit". Astrophysical Journal Letters. 663 (1): L37–L40. arXiv:0705.2004. Bibcode:2007ApJ...663L..37O. doi:10.1086/519793.

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