Astronomy: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 | |
| 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 |
| Distance | 1,660 ± 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 |
| Distance | 1,660 ± 90 ly (510 ± 30 pc) |
| Details[7] | |
| A | |
| Mass | 1.45±0.05 M☉ |
| Radius | 1.81±0.08 R☉ |
| Luminosity | 4.6[3] L☉ |
| Surface gravity (log g) | 4.09±0.03 cgs |
| Temperature | 6,295±65 K |
| Metallicity [Fe/H] | +0.28±0.09 dex |
| Rotational velocity (v sin i) | 8.5±0.5 km/s |
| Age | 2.2±0.4 Gyr |
| C | |
| Mass | 0.59[2] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | A |
| C | |
| Exoplanet Archive | data |
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,[9] in reference to its planet discovered by the Trans-Atlantic Exoplanet Survey (TrES). The discovery paper[4] and the SIMBAD database[8] use this designation for the planet itself, but other sources call the star TrES-4[10] 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]
| 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° |
1.838+0.081 −0.090 RJ |
See also
- List of extrasolar planets
Notes
- ↑ The secondary star is identified with a "C" suffix so as not to confuse it with the planetary designation suffix "b".
References
- ↑ Template:Cite constellation
- ↑ 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ 5.0 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.
- ↑ 6.0 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.
- ↑ 7.0 7.1 7.2 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.
- ↑ 8.0 8.1 "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.
- ↑ Template:Cite Exoplanet Archive
- ↑ 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.
- ↑ 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.
External links
- "TrES-4". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=TrES-4.
- Muir, Hazel (August 6, 2007). "Largest known exoplanet puzzles astronomers". NewScientist.com news service. https://www.newscientist.com/article/dn12430-largest-known-exoplanet-puzzles-astronomers.html.
Coordinates: 
17h 53m 13s, +37° 12′ 42″
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