Astronomy:GSC 02620-00648

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Short description: Star in the constellation Hercules

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GSC 02620-00648
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 Hercules[1]
A[2]
Right ascension  17h 53m 13.0490s[3]
Declination +37° 12′ 42.586″[3]
Apparent magnitude (V) 11.592[4]
C[lower-alpha 1]
Right ascension  17h 53m 13.0496s[5]
Declination +37° 12′ 44.139″[5]
Apparent magnitude (V) 13.85[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type F8[2]/K or M[2]
Apparent magnitude (B) 12.1120005±0.007[4]
Apparent magnitude (J) 10.583±0.018[6]
Apparent magnitude (H) 10.350±0.015[6]
Apparent magnitude (K) 10.330±0.019[6]
Astrometry
A
Radial velocity (Rv)−15.65±0.82[3] km/s
Proper motion (μ) RA: −6.382[3] mas/yr
Dec.: −20.891[3] mas/yr
Parallax (π)1.9686 ± 0.0136[3] mas
Distance1,660 ± 10 ly
(508 ± 4 pc)
C
Proper motion (μ) RA: −6.307 mas/yr
Dec.: −20.387 mas/yr
Parallax (π)1.9657 ± 0.1076[5] mas
Distance1,660 ± 90 ly
(510 ± 30 pc)
Details
A
Mass1.45±0.05[7] M☉
Radius1.78±0.06[8] R☉
Luminosity5.0±0.2[8] L☉
Surface gravity (log g)4.364±0.095[8] cgs
Temperature6,472±84[8] K
Metallicity [Fe/H]Template:M/H[8] dex
Rotational velocity (v sin i)8.5±0.5[7] km/s
Age2.2±0.4[7] Gyr
C
Mass0.59[2] M☉
Other designations
TrES-4 Parent Star, TYC 2620-648-1, GSC 02620-00648, 2MASS J17531304+3712426[9]
Database references
SIMBADA
C
Exoplanet Archivedata

GSC 02620-00648 is a binary star system located approximately 1,660 light-years away in the constellation Hercules. The brighter of the pair is a magnitude 12 star about 1.45 times as massive as the Sun. It hosts one known exoplanet, TrES-4b.[4]

Nomenclature

The designation GSC 02620-00648 comes from the Guide Star Catalog.

The star is sometimes called TrES-4,[10] in reference to its planet discovered by the Trans-Atlantic Exoplanet Survey (TrES). The discovery paper[4] and the SIMBAD database[9] use this designation for the planet itself, but other sources call the star TrES-4[11] and the planet TrES-4b,[7] following the standard exoplanet naming convention.

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.[2]

Planetary system

In 2006, the Trans-Atlantic Exoplanet Survey discovered the exoplanet TrES-4b using the transit method.[4] This planet orbits the primary star.[2] The planet is a low-density hot Jupiter, with a larger size than Jupiter but a smaller mass, and an orbital period of only four days.[7]

The GSC 02620-00648 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.498+0.033
−0.032 MJ 		0.05159+0.00059
−0.00061 		3.55392771(47) <0.015 83.07+0.51
−0.44° 		1.73±0.06[8] RJ

See also

  • List of extrasolar planets

Notes

  1. ↑ The secondary star is identified with a "C" suffix so as not to confuse it with the planetary designation suffix "b".

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. doi:10.1051/0004-6361/200810988. Bibcode: 2009A&A...498..567D. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Mandushev; O'Donovan, Francis T.; Charbonneau, David; Torres, Guillermo; Latham, David W.; Bakos, Gáspár Á.; Dunham, Edward W.; Sozzetti, Alessandro et al. (2007). "TrES-4: A Transiting Hot Jupiter of Very Low Density". The Astrophysical Journal Letters 667 (2): L195–L198. doi:10.1086/522115. Bibcode: 2007ApJ...667L.195M. 
  5. ↑ 5.0 5.1 5.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  6. ↑ 6.0 6.1 6.2 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode: 2003yCat.2246....0C. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Sozzetti, A. et al. (March 2015). "The GAPS programme with HARPS-N at TNG. VI. The curious case of TrES-4b". Astronomy & Astrophysics 575: L15. doi:10.1051/0004-6361/201425570. Bibcode: 2015A&A...575L..15S. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 de Laverny, Patrick; Ligi, Roxanne; Crida, Aurélien; Recio-Blanco, Alejandra; Palicio, Pedro A. (July 2025). "The Gaia spectroscopic catalogue of exoplanets and host stars". Astronomy & Astrophysics 699: A100. doi:10.1051/0004-6361/202554739. ISSN 0004-6361. Bibcode: 2025A&A...699A.100D. 
  9. ↑ 9.0 9.1 "NAME TrES-4 Parent Star". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+TrES-4+Parent+Star. 
  10. ↑ "TrES-4 Overview". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/TrES-4. 
  11. ↑ Narita, Norio et al. (June 2010). "Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation". Publications of the Astronomical Society of Japan 62 (3): 653–660. doi:10.1093/pasj/62.3.653. Bibcode: 2010PASJ...62..653N. 
  12. ↑ Bonomo, A. S. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. 

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



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