GSC 03549-02811 (sometimes referred to as TrES-2 A or TrES-2 parent star in reference to its exoplanet TrES-2b), also known as Kepler-1)[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]

GSC 03549-02811

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
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)	14.73[2]
Characteristics
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[5]
Apparent magnitude (H)	9.920±0.026[5]
Apparent magnitude (K)	9.846±0.022[5]
Variable type	Planetary transit[3]
Astrometry
Proper motion (μ)	RA: 5.434(15)[1] mas/yr Dec.: 1.572(16)[1] mas/yr
Parallax (π)	4.6308 ± 0.0116 mas[1]
Distance	704 ± 2 ly (215.9 ± 0.5 pc)
Details
Mass	1.05[2]/0.67[2] M☉
Radius	1.000+0.036 −0.033[6] R☉
Temperature	5850±50[6] K
Metallicity	−0.15±0.1[6]
Age	5.1+2.7 −2.3×109[6] years
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
SIMBAD	data

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]

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

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

• Trans-Atlantic Exoplanet Survey or TrES
• List of extrasolar planets

References

External links

• "Host to 'Hot Jupiter' (labeled)". multimedia/images. NASA. 2009-04-16. Retrieved 2009-04-28.
• "TrES-2". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2009-04-28.
• KIC 11446443

На других языках

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[ru] TrES-2