Astronomy:GSC 02652-01324
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lyra[2] |
| Right ascension | 19h 04m 09.8516s[3] |
| Declination | +36° 37′ 57.447″[3] |
| Apparent magnitude (V) | +11.806[4] |
| Characteristics | |
| Spectral type | K0V[5] |
| Apparent magnitude (B) | 12.405±0.005[4] |
| Apparent magnitude (J) | 10.294±0.022[6] |
| Apparent magnitude (H) | 9.887±0.021[6] |
| Apparent magnitude (K) | 9.819±0.019[6] |
| Variable type | Planetary transit[5][7] |
| Astrometry | |
| Radial velocity (Rv) | −20.54±0.40[3] km/s |
| Proper motion (μ) | RA: −32.168(12)[3] mas/yr Dec.: −20.463(13)[3] mas/yr |
| Parallax (π) | 6.2648 ± 0.0111[3] mas |
| Distance | 520.6 ± 0.9 ly (159.6 ± 0.3 pc) |
| Absolute magnitude (MV) | +5.847+0.097 −0.095[8] |
| Details[8] | |
| Mass | 0.878+0.038 −0.040 M☉ |
| Radius | 0.807+0.017 −0.016 R☉ |
| Luminosity | 0.438+0.035 −0.033 L☉ |
| Surface gravity (log g) | 4.567+0.012 −0.015 cgs |
| Temperature | 5230±50 K |
| Metallicity [Fe/H] | +0.02±0.05 dex |
| Rotation | 40.2+22.9 −14.6 d[9] |
| Rotational velocity (v sin i) | 1.30±0.30[10] km/s |
| Age | 3.7+3.4 −2.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GSC 02652-01324, also known as V672 Lyrae, is an orange dwarf main sequence star approximately 521 light-years away in the constellation of Lyra (the Lyre).[2][3] It hosts one known exoplanet, TrES-1b.[5]
There is a small, cool companion star at a separation of 13.2 arcseconds, corresponding to 2111 AU.[12]
Nomenclature
The designation GSC 02652-01324 comes from the Guide Star Catalog.
The star is sometimes called TrES-1,[13] in reference to its planet discovered by the Trans-Atlantic Exoplanet Survey (TrES). The discovery paper[5] and the SIMBAD database[11] use this designation for the planet itself, but other sources call the star TrES-1[14] and the planet TrES-1b,[15] following the standard exoplanet naming convention.
Since the planet transits the star, the star is classified as a planetary transit variable and has received the variable star designation V672 Lyrae. The transits last a little over an hour, about 4% of the orbital period, and the brightness diminishes by a few hundredths of a magnitude.[7]
Planetary system
In 2004, the exoplanet TrES-1b was found to be orbiting this star by the Trans-Atlantic Exoplanet Survey using the transit method. The planet was detected crossing its parent star using a small 4-inch-diameter (100 mm) telescope. The discovery was confirmed by the Keck Observatory using the radial velocity method, allowing its mass to be determined.[5][16] The planet is a hot Jupiter, with a mass and size similar to those of Jupiter but an orbital period of only three days.
Evidence of a candidate second planet, designated TrES-1c, was found in 2025 by the radial velocity method. If existing, this planet would have a minimum mass about that of Saturn, and an eccentric orbit with a 1,200-day period.[17]
An additional planet in the system is suspected due to transit-timing variations (TTVs) of TrES-1b,[15] but has not been detected.[17] For a planet causing the observed TTVs to remain undetected, it would need to have a mass less than ~0.25 |♃|J}}}}}} and an orbital period less than ~7 days. Other than the TTVs, there is as yet no evidence of such a planet, but the observed TTVs cannot be explained by other known effects.[17]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.697+0.028 −0.027 MJ |
0.03926+0.00058 −0.00060 |
3.0300689(7)[15] | <0.012 | 90.0+0.0 −1.1° |
1.067+0.022 −0.021 RJ |
| c (unconfirmed) | ≥0.36 MJ | 2.1 | 1200+26 −20 |
0.65±0.10 | — | — |
See also
References
- ↑ Winn, Joshua N.; Holman, Matthew J.; Roussanova, Anna (10 March 2007). "The Transit Light Curve Project. III. Tres Transits of TrES-1". The Astrophysical Journal 657 (2): 1098-1106. doi:10.1086/510834.
- ↑ 2.0 2.1 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.
- ↑ 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 Henden, A. A. et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H 2336. Bibcode: 2016yCat.2336....0H.Vizier catalog entry
- ↑ 5.0 5.1 5.2 5.3 5.4 Alonso, Roi et al. (2004). "TrES-1: The Transiting Planet of a Bright K0V Star". The Astrophysical Journal Letters 613 (2): L153–L156. doi:10.1086/425256. Bibcode: 2004ApJ...613L.153A.
- ↑ 6.0 6.1 6.2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. Vizier catalog entry
- ↑ 7.0 7.1 "V672 Lyr". General Catalog of Variable Stars - VizieR. https://vizier.cds.unistra.fr/viz-bin/VizieR-S?V*%20V672%20Lyr.
- ↑ 8.0 8.1 Torres, Guilermo et al. (2008). "Improved Parameters for Extrasolar Transiting Planets". Astrophysical Journal 677 (2): 1324–1342. doi:10.1086/529429. Bibcode: 2008ApJ...677.1324T.
- ↑ Dittmann, Jason A. et al. (August 2009). "A Tentative Detection of a Starspot During Consecutive Transits of an Extrasolar Planet from the Ground: No Evidence of a Double Transiting Planet System Around TrES-1". The Astrophysical Journal 701 (1): 756-763. doi:10.1088/0004-637X/701/1/756. Bibcode: 2009ApJ...701..756D.
- ↑ 10.0 10.1 Bonomo, A. S. et al. (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 and Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. https://www.aanda.org/articles/aa/full_html/2017/06/aa29882-16/aa29882-16.html.
- ↑ 11.0 11.1 "TrES-1 Parent Star". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TrES-1+Parent+Star.
- ↑ Mugrauer, M. (December 2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088–5102. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M.
- ↑ "TrES-1 Overview". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/TrES-1.
- ↑ Baluev, Roman V. et al. (2015). "Benchmarking the power of amateur observatories for TTV exoplanets detection". Monthly Notices of the Royal Astronomical Society 450 (3): 3101–3113. doi:10.1093/mnras/stv788. Bibcode: 2015MNRAS.450.3101B.
- ↑ 15.0 15.1 15.2 Yeung, Paige; Perian, Quinn; Robertson, Peyton; Fitzgerald, Michael; Fowler, Martin; Sienkiewicz, Frank; Tock, Kalee (2022), "Searching for Transit Timing Variations and Fitting a New Ephemeris to Transits of TrES-1 b", Journal of the Korean Astronomical Society 55 (4): 111, doi:10.5303/JKAS.2022.55.4.111, Bibcode: 2022JKAS...55..111Y
- ↑ "Keck confirms transit planet" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. August 24, 2004. Retrieved August 14, 2019.
- ↑ 17.0 17.1 17.2 Hagley, Simone R. et al. (August 2025). "TrES-1 b: A Case Study in Detecting Secular Evolution of Exoplanet Orbits". The Astronomical Journal.
External links
- "Planet TRES-1 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/tres_1_b--246/. Retrieved 2018-11-28.
Coordinates: 
19h 04m 09s, +36° 37′ 57″
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