Epoch J2000.0 Equinox J2000.0
|Right ascension||19h 07m 14.0369s|
|Declination||+49° 18′ 59.097″|
|Apparent magnitude (V)||11.41|
|Right ascension||~19h 07m 14s|
|Declination||~+49° 18′ 59″|
|Apparent magnitude (V)||14.73|
|Apparent magnitude (B)||~12.030|
|Apparent magnitude (V)||±0.00511.411|
|Apparent magnitude (J)||±0.02010.232|
|Apparent magnitude (H)||±0.0269.920|
|Apparent magnitude (K)||±0.0229.846|
|Proper motion (μ)|| RA: ±0.9465.846 mas/yr |
Dec.: ±0.6661.166 mas/yr
|Parallax (π)||4.32 ± 0.25 mas|
|Distance||750 ± 40 ly |
(230 ± 10 pc)
GSC 03549-02811 (sometimes referred to as TrES-2 A or TrES-2 parent star in reference to its exoplanet TrES-2), also known as Kepler-1) is a yellow main-sequence star similar to our Sun. This star is located approximately 750 light-years away in the constellation of Draco. The apparent magnitude of this star is 11.41, which means it is not visible to the naked eye but can be seen with a medium-sized amateur telescope on a clear dark night. The age of this star is about 5 billion years.
In 2006 the exoplanet TrES-2 was discovered by the TrES program using the transit method. It is also within the field of view of the previously operational Kepler Mission planet-hunter spacecraft. This system continues to be studied by other projects and the parameters are continuously improved. The planet orbits the primary star.
(in order from star)
|TrES-2b||±0.052 1.199MJ||55±0.00075 0.035||6133738±0.0000000187 2.470||0 (assumed)||±0.00983.908°||±0.025 1.189RJ|
Though TrES-2b is currently the darkest known exoplanet, reflecting less than 1 percent of local sunlight, it shows a faint red glow. This is because its surface is 1,100 °C, it is so hot that it glows red. It is assumed to be tidally locked to its parent star.
In 2008 a study was undertaken of fourteen stars with exoplanets that were originally discovered using the transit method through relatively small telescopes. These systems were re-examined with the 2.2M reflector telescope at the Calar Alto Observatory in Spain. This star system, along with two others, was determined to be a previously unknown binary star system. The previously unknown secondary star is a dim magnitude 15 K-type star separated by about 232 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a significant recalculation of parameters for both the planet and the primary star.
The Kepler Mission
In March 2009 NASA launched the Kepler Mission spacecraft. This spacecraft is a dedicated mission to discover extrasolar planets by the transit method from solar orbit. In April 2009 the project released the first light images from the spacecraft and TrES-2b was one of two objects highlighted in these images. Although TrES-2b is not the only known exoplanet in the field of view of this spacecraft it is the only one identified in the first-light images. This object is important for calibration and check-out.
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- "Kepler Eyes Cluster and Known Planet". NASA. 2009-04-16. Retrieved 2009-05-09.
- "Host to 'Hot Jupiter' (labeled)". multimedia/images. NASA. 2009-04-16. Retrieved 2009-04-28.
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- KIC 11446443