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Exoplanet List of exoplanets
Exoplanet Comparison TrES-3 b.png
Size comparison of TrES-3 with Jupiter.
Parent star
Star GSC 03089-00929
Constellation Hercules
Right ascension (α) 17h 52m 07s
Declination (δ) +37° 32′ 46″
Distance 1300 ± 600 ly
(400 ± 200 pc)
Spectral type G
Orbital elements
Semi-major axis (a) 0.0226 ± 0.0013 AU
Orbital period (P) 1.30619 ± 0.00005 d
Inclination (i) 82.15°
Physical characteristics
Mass (m) 1.92 ± 0.23 MJ
Radius (r) 1.341 ± 0.081 RJ
Density (ρ) 1172 kg m−3
Surface gravity (g) 2.7 g
Discovery information
Discovery date 2007
Discoverer(s) O'Donovan et al.
Discovery method Transit
Discovery site United States
Discovery status Published
Other designations
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

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.

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. Its mass was confirmed via radial velocity measurements of the host star, which showed the presence of a planet mass companion with the same period as the transits. 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 also[edit]


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

External links[edit]

Media related to TrES-3 at Wikimedia Commons

Coordinates: Sky map 17h 52m 07s, +37° 32′ 46″