Epoch J2000.0 Equinox J2000.0
|Right ascension||19h 07m 14.035s|
|Declination||+49° 18′ 59.07″|
|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: 2.9 mas/yr
Dec.: -3.4 mas/yr
GSC 03549-02811 A (referred to as TrES-2 or TrES-2 A in reference to its exoplanet, also known as Kepler-1) is a yellow main-sequence star similar to our Sun. This star is located approximately 718 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-2b 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||±0.0521.199 MJ||56±0.000750.035||63±0.000012.470||0||—||1.272 RJ|
Though TrES-2b is currently the darkest known exoplanet, reflecting less than 1 percent of local sunlight, it does show a faint red glow. This is because its surface is a punishing 1,100°C, so hot that it actually 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.
- "SIMBAD query result: NAME TrES-2 Parent Star -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-22.
- Daemgen; Hormuth, F.; Brandner, W.; Bergfors, C.; Janson, M.; Hippler, S.; Henning, T. (2009). "Binarity of transit host stars — Implications for planetary parameters" (PDF). Astronomy and Astrophysics 498 (2): 567–574. arXiv:0902.2179. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988.
- Alessandro Sozzetti; Torres, Guillermo; Charbonneau, David; Latham, David W.; Holman, Matthew J.; Winn, Joshua N.; Laird, John B.; o’Donovan, Francis T. (August 1, 2007). "Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2". The Astrophysical Journal 664 (2): 1190–1198. arXiv:0704.2938. Bibcode:2007ApJ...664.1190S. doi:10.1086/519214.
- D. Mislis; S. Schroter; J.H.M.M. Schmitt; O. Cordes; K. Reif (December 2009). "Multi-band transit observations of the TrES-2b exoplanet". arXiv:0912.4428v1 [astro-ph.EP].
- O'Donovan; Charbonneau, David; Mandushev, Georgi; Dunham, Edward W.; Latham, David W.; Torres, Guillermo; Sozzetti, Alessandro; Brown, Timothy M.; et al. (October 16, 2006). "TrES-2: The First Transiting Planet in the Kepler Field". The Astrophysical Journal Letters 651 (1): L61–L64. arXiv:astro-ph/0609335. Bibcode:2006ApJ...651L..61O. doi:10.1086/509123.
- "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.
- "TrES-2". Exoplanets. Retrieved 2009-04-28.