GSC 02620-00648

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GSC 02620-00648
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules
A[1]
Right ascension 17h 53m 13.058s[2]
Declination +37° 12′ 42.36″[2]
Apparent magnitude (V) 11.592[2]
Ca
Right ascension ~17h 53m 13s[1]
Declination ~+37° 12′ 42″[1]
Apparent magnitude (V) 13.85[1]
Characteristics
Spectral type F8[1]/K or M[1]
Apparent magnitude (B) 12.1120005 ±0.007[3]
Apparent magnitude (V) 11.592 ±0.004[3]
Apparent magnitude (J) 10.583 ±0.018[2]
Apparent magnitude (H) 10.350 ±0.015[2]
Apparent magnitude (K) 10.330 ±0.019[2]
Astrometry
Proper motion (μ) RA: -8.1[2] mas/yr
Dec.: -33.0[2] mas/yr
Distance 1400 ± 200 ly
(430 ± 60 pc)
Details
Mass 1.18[1]/0.59[1] M
Temperature 6200 ± 75 K
Metallicity 0.14 ± 0.09
Age 4.7 ± 2 × 109 years
Other designations
TrES-4 Parent Star, 2MASS J17531304+3712426, TYC 2620-648-1[2]
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

GSC 02620-00648 A is a magnitude 12 star located approximately 1400 light-years away in the constellation of Hercules.[2] This star is about 1.18 times as massive as the Sun.[1]

Planetary system[edit]

In 2006 the TrES program discovered exoplanet TrES-4 using the transit method.[3] This planet orbits the primary star.[1]

The GSC 02620-00648 system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
TrES-4 0.919 ± 0.073[1] MJ 0.05091 ± 0.00071[1] 3.553945 ± 7.5e-05 0

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 14 K or M-type star separated by about 755 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a recalculation of parameters for both the planet and the primary star.[1]

Notes[edit]

  • Note b: The secondary star is identified with a "C" suffix so as to not confuse it with the planetary designation suffix "b".[1]

See also[edit]

References[edit]

  1. ^ a b c d e f g h i j k l m n 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". Astronomy and Astrophysics 498 (2): 567–574. arXiv:0902.2179. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988. 
  2. ^ a b c d e f g h i j "SIMBAD query result: NAME TrES-4 Parent Star -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-23. 
  3. ^ a b c Mandushev et al.; O'Donovan, Francis T.; Charbonneau, David; Torres, Guillermo; Latham, David W.; Bakos, Gáspár Á.; Dunham, Edward W.; Sozzetti, Alessandro; Fernández, José M.; Esquerdo, Gilbert A.; Everett, Mark E.; Brown, Timothy M.; Rabus, Markus; Belmonte, Juan A.; Hillenbrand, Lynne A. (2007). "TrES-4: A Transiting Hot Jupiter of Very Low Density". The Astrophysical Journal Letters 667 (2): L195–L198. arXiv:0708.0834. Bibcode:2007ApJ...667L.195M. doi:10.1086/522115. 

External links[edit]

Coordinates: Sky map 17h 53m 13s, +37° 12′ 42″