GSC 03549-02811
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Draco |
| A | |
| Right ascension | 19h 07m 14.035s[1] |
| Declination | +49° 18′ 59.07″[1] |
| Apparent magnitude (V) | 11.41 |
| Ca | |
| Right ascension | ~19h 07m 14s[2] |
| Declination | ~+49° 18′ 59″[2] |
| Apparent magnitude (V) | 14.73[2] |
| Characteristics | |
| Spectral type | G0V[1]/K[2] |
| Apparent magnitude (B) | ~12.030[1] |
| Apparent magnitude (V) | 11.411±0.005[1] |
| Apparent magnitude (J) | 10.232±0.020[1] |
| Apparent magnitude (H) | 9.920±0.026[1] |
| Apparent magnitude (K) | 9.846±0.022[1] |
| Astrometry | |
| Proper motion (μ) | RA: 2.9[1] mas/yr Dec.: -3.4[1] mas/yr |
| Distance | 718±33 ly (220±10 pc) |
| Details | |
| Mass | 1.05[2]/0.67[2] M☉ |
| Radius | 1.000+0.036 −0.033[3] R☉ |
| Temperature | 5,850±50[3] K |
| Metallicity | −0.15±0.1[3] |
| Age | 5.1+2.7 −2.3×109[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
GSC 03549-02811 A (referred to in the exoplanet literature as TrES-2)[4] 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.[1]
Contents |
[edit] Planetary system
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 now-operational Kepler Mission planet-hunter spacecraft.[5] This system continues to be studied by other projects and the parameters are continuously improved.[3] The planet orbits the primary star.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| TrES-2b | 1.199±0.052[2] MJ | 0.03556±0.00075[2] | 2.47063±0.00001[5] | 0 |
Though TrES-2b is currently the darkest known exoplanet, reflecting less than 1 percent of local sunlight, it does show a faint red glow. It is assumed to be tidally locked to its parent star.[6]
[edit] Binary 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.[2]
[edit] 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.[7]
[edit] Notes
- Note b: The secondary star is identified with a "C" suffix so as to not confuse it with the planetary designation suffix "b".[2]
[edit] See also
[edit] References
- ^ a b c d e f g h i j k l "SIMBAD query result: NAME TrES-2 Parent Star -- Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GSC03549-02811. Retrieved 2009-04-22.
- ^ a b c d e f g h i j k Daemgen et al.; 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. Bibcode 2009A&A...498..567D. doi:10.1051/0004-6361/200810988. http://www.mpia.de/homes/henning/Publications/daemgen.pdf.
- ^ a b c d e Alessandro Sozzetti et al. (August 1, 2007). "Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2". The Astrophysical Journal 664 (2): 1190–1198. Bibcode 2007ApJ...664.1190S. doi:10.1086/519214. http://www.iop.org/EJ/article/0004-637X/664/2/1190/71636.html.
- ^ D. Mislis, S. Schroter, J.H.M.M. Schmitt, O. Cordes, K. Reif (astro-ph.EP). "Multi-band transit observations of the TrES-2b exoplanet". arXiv:0912.4428v1.
- ^ a b O'Donovan et al.; 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. http://www.iop.org/EJ/article/-search=64845589.1/1538-4357/651/1/L61/21047.html.
- ^ http://news.yahoo.com/coal-black-alien-planet-darkest-ever-seen-220601419.html
- ^ "Kepler Eyes Cluster and Known Planet". NASA. 2009-04-16. http://www.nasa.gov/mission_pages/kepler/multimedia/images/fullFFIHot300.html. Retrieved 2009-05-09.
[edit] External links
- "Host to 'Hot Jupiter' (labeled)". multimedia/images. NASA. 2009-04-16. http://www.nasa.gov/mission_pages/kepler/multimedia/images/TrES2Hot300.html. Retrieved 2009-04-28.
- "TrES-2". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=TrES-2. Retrieved 2009-04-28.
