TrES-3

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**TrES-3**
Parent star
Extrasolar planet		List of extrasolar planets
Star		GSC 03089-00929
Constellation		Hercules
Right ascension	(α)	17^h 52^m 07^s
Declination	(δ)	+37° 32′ 46″
Distance		1300 ± 600 ly (400 ± 200 pc)
Spectral type		G
Orbital elements
Semimajor axis	(a)	0.0226 ± 0.0013 AU
Orbital period	(P)	1.30619 ± 0.00005 d
Inclination	(i)	82.15°
Angular distance	(θ)	0.06 mas
Physical characteristics
Mass	(m)	1.92 ± 0.23 M_J
Radius	(r)	1.295 ± 0.081 R_J
Density	(ρ)	1172 kg/m³
Surface gravity	(g)	2.7 g
Discovery information
Discovery date		2007
Discoverer(s)		O'Donovan et al.
Detection method		Transit
Discovery status		Published

TrES-3 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 is a very massive planet, nearly twice the mass of Jupiter.

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. The planet's home star is slightly smaller and cooler than the Sun. The 'year' is less than one and a third days, one of the shortest known.

[edit] References

O'Donovan, Francis T.; David Charbonneau, Gáspár Á. Bakos, Georgi Mandushev, Edward W. Dunham, Timothy M. Brown, David W. Latham, Guillermo Torres, Alessandro Sozzetti, Géza Kovács, Mark E. Everett, Nairn Baliber, Márton G. Hidas, Gilbert A. Esquerdo, Markus Rabus, Hans J. Deeg, Juan A. Belmonte, Lynne A. Hillenbrand, Robert P. Stefanik (2007). "TrES-3: A Nearby, Massive, Transiting Hot Jupiter in a 31-Hour Orbit". Astrophysical Journal Letters 663: L37. doi:10.1086/519793.