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TrES-2b
Exoplanet in the constellation Draco, known for 'Darkest Exoplanet' / From Wikipedia, the free encyclopedia
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TrES-2b (also known as Kepler-1b or GSC 03549-02811b) is an extrasolar planet orbiting the star GSC 03549-02811 located 750 light years away from the Solar System. The planet was identified in 2011 as the darkest known exoplanet, reflecting less than 1% of any light that hits it. Reflecting less light than charcoal, on the surface the planet is said to be pitch black.[4] The planet's mass and radius indicate that it is a gas giant with a bulk composition similar to that of Jupiter. Unlike Jupiter, but similar to many planets detected around other stars, TrES-2b is located very close to its star and belongs to the class of planets known as hot Jupiters. This system was within the field of view of the Kepler spacecraft.[1]
![]() An artist's impression of TrES-2b with its host star | |
Discovery[1] | |
---|---|
Discovered by | O'Donovan et al. |
Discovery site | California & Arizona, USA |
Discovery date | August 21, 2006 confirmed September 8, 2006 |
Transit | |
Orbital characteristics | |
0.03556±0.00075 AU | |
Eccentricity | 0 |
2.47063±0.00001 d | |
Inclination | 83.62±0.14[2] |
Star | GSC 03549-02811 A[2] |
Physical characteristics | |
1.272±0.041[2] RJ | |
Mass | 1.199±0.052[2] MJ |
3.284±0.016[2] g | |
Albedo | 0.0136 |
Temperature | 1885+51 −66 K.[3] |
This planet continues to be studied by other projects, and the parameters are continuously improving. A 2007 study improved stellar and planetary parameters.[5] A 2008 study concluded that the TrES-2 system is a binary star system. This significantly affects the values for the stellar and the planetary parameters.[2]