GSC 03549-02811

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GSC 03549-02811
Kepler First Light Detail TrES-2.jpg
GSC 03549-02811 and TrES-2b as seen from the Kepler spacecraft. Celestial north is to the left.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Draco
Right ascension 19h 07m 14.0369s[1]
Declination +49° 18′ 59.097″[1]
Apparent magnitude (V) 11.41
Right ascension ~19h 07m 14s[2]
Declination ~+49° 18′ 59″[2]
Apparent magnitude (V) 14.73[2]
Spectral type G0V[3]/K[2]
Apparent magnitude (B) ~12.030[4]
Apparent magnitude (V) 11.411±0.005[4]
Apparent magnitude (J) 10.232±0.020[4]
Apparent magnitude (H) 9.920±0.026[4]
Apparent magnitude (K) 9.846±0.022[4]
Proper motion (μ) RA: 5.846±0.946[1] mas/yr
Dec.: 1.166±0.666[1] mas/yr
Parallax (π)4.32 ± 0.25[1] mas
Distance750 ± 40 ly
(230 ± 10 pc)
Mass1.05[2]/0.67[2] M
[5] R
Temperature5850±50[5] K
[5] years
Other designations
TrES-2 Parent Star, WDS J19072+4919AB, Kepler-1, KOI-1, KIC 11446443, TYC 3549-2811-1, 2MASS J19071403+4918590[4]
Database references
Extrasolar Planets

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)[6] 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.[4]

Planetary system[edit]

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.[3] This system continues to be studied by other projects and the parameters are continuously improved.[5] The planet orbits the primary star.[2]

The GSC 03549-02811 planetary system[7][2]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
TrES-2b 1.199±0.052 MJ 0.03555±0.00075 2.4706133738±0.0000000187 0 (assumed) 83.908±0.009° 1.189±0.025 RJ

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.[8]

Binary star[edit]

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.[2]

The Kepler Mission[edit]

An image from Kepler with TrES-2b and another point of interest outlined. Celestial north is towards the lower left corner.

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.[9]

See also[edit]


  1. ^ a b c d e Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172Freely accessible. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry
  2. ^ a b c d e f g h i Daemgen, S.; et al. (2009). "Binarity of transit host stars. Implications for planetary parameters". Astronomy and Astrophysics. 498 (2): 567–574. arXiv:0902.2179Freely accessible. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988. 
  3. ^ a b O'Donovan, Francis T.; et al. (2006). "TrES-2: The First Transiting Planet in the Kepler Field". The Astrophysical Journal Letters. 651 (1): L61–L64. arXiv:astro-ph/0609335Freely accessible. Bibcode:2006ApJ...651L..61O. doi:10.1086/509123. 
  4. ^ a b c d e f g "Kepler-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-22. 
  5. ^ a b c d e 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:0704.2938Freely accessible. Bibcode:2007ApJ...664.1190S. doi:10.1086/519214. 
  6. ^ 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:0912.4428v1Freely accessible [astro-ph.EP]. 
  7. ^ Raetz, St.; et al. (2014). "Transit timing of TrES-2: A combined analysis of ground- and space-based photometry". Monthly Notices of the Royal Astronomical Society. 444 (2): 1351–1368. arXiv:1408.7022Freely accessible. Bibcode:2014MNRAS.444.1351R. doi:10.1093/mnras/stu1505. 
  8. ^
  9. ^ "Kepler Eyes Cluster and Known Planet". NASA. 2009-04-16. Retrieved 2009-05-09. 

External links[edit]

Coordinates: Sky map 19h 07m 14s, +49° 18′ 59″