GSC 02620-00648

GSC 02620-00648 is a double star in the constellation Hercules. The brighter of the pair is a magnitude 12 star located approximately 1,660 light-years away. This star is about 1.18 times as massive as the Sun.[1]

GSC 02620-00648
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules
A[1]
Right ascension 17h 53m 13.0490s[2]
Declination +37° 12′ 42.586″[2]
Apparent magnitude (V) 11.592[3]
Ca
Right ascension ~17h 53m 13.0496s[4]
Declination ~+37° 12′ 44.139″[4]
Apparent magnitude (V) 13.85[1]
Characteristics
Spectral type F8[1]/K or M[1]
Apparent magnitude (B) 12.1120005 ±0.007[5]
Apparent magnitude (V) 11.592 ±0.004[5]
Apparent magnitude (J) 10.583 ±0.018[3]
Apparent magnitude (H) 10.350 ±0.015[3]
Apparent magnitude (K) 10.330 ±0.019[3]
Astrometry
A
Proper motion (μ) RA: −6.382[2] mas/yr
Dec.: −20.891[2] mas/yr
Parallax (π)1.9686 ± 0.0124 mas[2]
Distance1,660 ± 10 ly
(508 ± 3 pc)
C
Proper motion (μ) RA: −6.307[4] mas/yr
Dec.: −20.387[4] mas/yr
Parallax (π)1.9657 ± 0.1076 mas[4]
Distance1,660 ± 90 ly
(510 ± 30 pc)
Details
A
Mass1.18[1] M☉
Radius1.9[2] R☉
Luminosity4.6[2] L☉
Surface gravity (log g)3.98[2] cgs
Temperature6,200±75 K
Metallicity [Fe/H]+0.14±0.09 dex
Rotational velocity (v sin i)8.3[6] km/s
Age4.7±2 Gyr
B
Mass0.59[1] M☉
Other designations
TrES-4 Parent Star, 2MASS J17531304+3712426, TYC 2620-648-1[3]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Planetary system

In 2006 the TrES program discovered exoplanet TrES-4b using the transit method.[5] This planet orbits the primary star.[1]

The GSC 02620-00648 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.919 ± 0.073[1] MJ 0.05091 ± 0.00071[1] 3.553945 ± 7.5e-05 0 — 1.799[7] RJ

Binary star

In 2008 a study was undertaken of 14 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]

See also

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

References
  1. Daemgen; 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. S2CID 9893376.
  2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. "NAME TrES-4 Parent Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-23.
  4. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. Mandushev; 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. S2CID 6087170.
  6. Brewer, John M.; Fischer, Debra A. (2018). "Spectral Properties of Cool Stars: Extended Abundance Analysis of Kepler Objects of Interest". The Astrophysical Journal Supplement Series. 237 (2): 38. arXiv:1804.00673. Bibcode:2018ApJS..237...38B. doi:10.3847/1538-4365/aad501. S2CID 119431797.
  7. Daemgen, S.; Hormuth, F.; Brandner, W.; Bergfors, C.; Janson, M.; Hippler, S.; Henning, Th (May 2009). "Binarity of Transit Host Stars - Implications on Planetary Parameters". Astronomy & Astrophysics. 498 (2): 567–574. arXiv:0902.2179. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988. ISSN 0004-6361. S2CID 9893376.
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