Astronomy:GSC 03549-02811

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Short description: Main sequence - star in the constellation Draco
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
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Draco
A
Right ascension  19h 07m 14.0376s[1]
Declination +49° 18′ 59.091″[1]
Apparent magnitude (V) 11.41
B
Right ascension ~ 19h 07m 14s[2]
Declination ~+49° 18′ 59″[2]
Apparent magnitude (V) {{{appmag_v2}}}
Characteristics
A
Spectral type G0V[3]
Apparent magnitude (B) ~12.030[4]
Apparent magnitude (V) 11.411±0.005[4]
Apparent magnitude (I) 11.07[2]
Apparent magnitude (Z) 11.04[2]
Apparent magnitude (J) 10.232±0.020[5]
Apparent magnitude (H) 9.920±0.026[5]
Apparent magnitude (K) 9.846±0.022[5]
Variable type Planetary transit[3]
B
Spectral type K[2]
Apparent magnitude (I) 14.73[2]
Apparent magnitude (Z) 14.47[2]
Astrometry
Proper motion (μ) RA: 5.434(15)[1] mas/yr
Dec.: 1.572(16)[1] mas/yr
Parallax (π)4.6308 ± 0.0116[1] mas
Distance704 ± 2 ly
(215.9 ± 0.5 pc)
Details
A
Mass1.05[2] M
Radius1.000+0.036
−0.033
[6] R
Temperature5850±50[6] K
Metallicity−0.15±0.1[6]
Age5.1+2.7
−2.3
×109
[6] years
B
Mass0.67[2] M
Other designations
TrES-2 Parent Star, V581 Dra, WDS J19072+4919AB, Kepler-1, KOI-1, KIC 11446443, TYC 3549-2811-1, 2MASS J19071403+4918590[4]
Database references
SIMBADdata

GSC 03549-02811 (sometimes referred to as Kepler-1, or either TrES-2A or TrES-2 parent star in reference to its exoplanet TrES-2b)[7] is a yellow main-sequence star similar to the Sun. This star is located approximately 704 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

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.[3] This system continues to be studied by other projects and the parameters are continuously improved.[6] The planet orbits the primary star.[2]

The GSC 03549-02811 planetary system[8][2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.199(52) MJ 0.03555(75) 2.4706133738(187) 0 (assumed) 83.908(9)° 1.189(25) 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.[9]

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]

The Kepler mission

Main page: Astronomy:Kepler space telescope
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 spacecraft. This spacecraft was 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.[10]

See also

References

  1. 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Daemgen, S. et al. (2009). "Binarity of transit host stars. Implications for planetary parameters". Astronomy and Astrophysics 498 (2): 567–574. doi:10.1051/0004-6361/200810988. Bibcode2009A&A...498..567D. 
  3. 3.0 3.1 3.2 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. doi:10.1086/509123. Bibcode2006ApJ...651L..61O. 
  4. 4.0 4.1 4.2 4.3 "Kepler-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1. 
  5. 5.0 5.1 5.2 Skrutskie, Michael F. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. Bibcode2006AJ....131.1163S.  Vizier catalog entry
  6. 6.0 6.1 6.2 6.3 6.4 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. doi:10.1086/519214. Bibcode2007ApJ...664.1190S. http://www.iop.org/EJ/article/0004-637X/664/2/1190/71636.html. 
  7. 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].
  8. 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. doi:10.1093/mnras/stu1505. Bibcode2014MNRAS.444.1351R. 
  9. "Coal-Black Alien Planet is Darkest Ever Seen". 11 August 2011. https://news.yahoo.com/coal-black-alien-planet-darkest-ever-seen-220601419.html. 
  10. "Kepler Eyes Cluster and Known Planet". NASA. 2009-04-16. http://www.nasa.gov/mission_pages/kepler/multimedia/images/fullFFIHot300.html. 

External links

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