Kepler-1658
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 18h 46m 22.24188s[2] |
| Declination | +75° 26′ 02.2400″[2] |
| Apparent magnitude (V) | 11.556±0.100[3] |
| Characteristics | |
| A | |
| Evolutionary stage | Subgiant[4] |
| Spectral type | F5[5] |
| BC | |
| Evolutionary stage | main sequence[6] |
| Spectral type | KV + MV[6] |
| Variable type | eclipsing binary[6] |
| Astrometry | |
| Radial velocity (Rv) | −21.815±0.053[7] km/s |
| Proper motion (μ) | RA: +0.100 mas/yr[2] Dec.: −5.542 mas/yr[2] |
| Parallax (π) | 1.2260±0.0173 mas[2] |
| Distance | 2,660 ± 40 ly (820 ± 10 pc) |
| Orbit[6] | |
| Primary | A |
| Companion | BC |
| Semi-major axis (a) | 50 AU |
| Orbit[6] | |
| Primary | B |
| Companion | C |
| Period (P) | 3.849363145 days |
| Details[8] | |
| Kepler-1658 A | |
| Mass | 1.45±0.03 M☉ |
| Radius | 3.26±0.14 R☉ |
| Surface gravity (log g) | 4.13±0.05 cgs |
| Temperature | 5,948±100 K |
| Metallicity [Fe/H] | −0.27±0.06 dex |
| Rotational velocity (v sin i) | 38 km/s |
| Age | 2.0±0.1 Gyr |
| Kepler-1658 B | |
| Mass | 0.75[6] M☉ |
| Kepler-1658 C | |
| Mass | 0.19[6] M☉ |
| Radius | 0.23[6] R☉ |
| Other designations | |
| KOI-4, KIC 3861595, TIC 377873569, TYC 3135-652-1[9] | |
| Database references | |
| SIMBAD | data |
Kepler-1658 is a triple star system located in the constellation Cygnus.[1] Based on parallax measurements by the Gaia spacecraft,[2] it is located at a distance of 2,660 light-years (820 parsecs).
This is an hierarchical triple system whose primary is an F-type subgiant star with 1.45 times the Sun's mass and 3.26 times the Sun's radius.[8] The outer system, 50 astronomical units away from the primary, is an eclipsing binary whose components have an orbital period of 3.8 days: star B is probably a K-type dwarf with 0.8 times the Sun's mass, and star C a red dwarf with 0.19 times the mass of the Sun and 0.23 times the radius.[6]
Search for planets
[edit]In 2009, a hot Jupiter planet candidate (KOI-4.01, now known as Kepler-1658b) was identified around Kepler-1658 by the Kepler space telescope via the transit method. Initially ruled out as a false alarm, a 2019 study re-claimed its nature as a planet. This would be the first planet ever detected by Kepler.[4] Analysis of the Transiting Exoplanet Survey Satellite (TESS) data in 2022 showed that it is gradually spiraling into its star, with its orbit decaying.[10] However, in 2025 it was demonstrated that Kepler-1658b is a false positive planet.[6] In reality, all the data that supported the detection of a planet with physical orbital decay were caused by the eclipsing outer system, whose light travel time effect is responsible for the supposed orbital decay.[6]
References
[edit]- ^ a b Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e 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.
- ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2013-01-14). "The Fourth Us Naval Observatory CCD Astrograph Catalog (Ucac4)". The Astronomical Journal. 145 (2): 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256.
- ^ a b Chontos, Ashley; Huber, Daniel; Latham, David W.; Bieryla, Allyson; Eylen, Vincent Van; Bedding, Timothy R.; Berger, Travis; Buchhave, Lars A.; Campante, Tiago L.; Chaplin, William J.; Colman, Isabel L.; Coughlin, Jeff L.; Davies, Guy; Hirano, Teruyuki; Howard, Andrew W. (2019). "The Curious Case of KOI 4: Confirming Kepler ' s First Exoplanet Detection". The Astronomical Journal. 157 (5): 192. arXiv:1903.01591. Bibcode:2019AJ....157..192C. doi:10.3847/1538-3881/ab0e8e. ISSN 1538-3881. S2CID 119240124.
- ^ Su, Tianhao; Zhang, Li-yun; Long, Liu; Han, Xianming L.; Misra, Prabhakar; Meng, Gang; Pi, Qingfeng; Yang, ZiLu; Yang, Jiawei (2022-07-27). "Magnetic Activity and Physical Parameters of Exoplanet Host Stars Based on LAMOST DR7, TESS, Kepler, and K2 Surveys". The Astrophysical Journal Supplement Series. 261 (2): 26. Bibcode:2022ApJS..261...26S. doi:10.3847/1538-4365/ac7151. ISSN 0067-0049.
- ^ a b c d e f g h i j k Winn, Joshua N.; Stefánsson, Guðmundur (2025). "Orbital decay candidates reconsidered: WASP-4 b is not decaying and Kepler-1658 b is not a planet". arXiv:2510.05229 [astro-ph.EP].
- ^ Jönsson, Henrik; Holtzman, Jon A.; Prieto, Carlos Allende; Cunha, Katia; García-Hernández, D. A.; Hasselquist, Sten; Masseron, Thomas; Osorio, Yeisson; Shetrone, Matthew; Smith, Verne; Stringfellow, Guy S.; Bizyaev, Dmitry; Edvardsson, Bengt; Majewski, Steven R.; Mészáros, Szabolcs (2020-08-17). "APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South". The Astronomical Journal. 160 (3): 120. arXiv:2007.05537. Bibcode:2020AJ....160..120J. doi:10.3847/1538-3881/aba592. ISSN 0004-6256.
- ^ a b Petigura, Erik A.; Rogers, James G.; Isaacson, Howard; Owen, James E.; Kraus, Adam L.; Winn, Joshua N.; MacDougall, Mason G.; Howard, Andrew W.; Fulton, Benjamin; Kosiarek, Molly R.; Weiss, Lauren M.; Behmard, Aida; Blunt, Sarah (April 2022). "The California-Kepler Survey. X. The Radius Gap as a Function of Stellar Mass, Metallicity, and Age". The Astronomical Journal. 163 (4): 179. arXiv:2201.10020. Bibcode:2022AJ....163..179P. doi:10.3847/1538-3881/ac51e3. ISSN 0004-6256.
- ^ "Kepler-1658". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Vissapragada, Shreyas; Chontos, Ashley; Greklek-McKeon, Michael; Knutson, Heather A.; Dai, Fei; González, Jorge Pérez; Grunblatt, Sam; Huber, Daniel; Saunders, Nicholas (2022). "The Possible Tidal Demise of Kepler's First Planetary System". The Astrophysical Journal Letters. 941 (2): L31. arXiv:2212.09752. Bibcode:2022ApJ...941L..31V. doi:10.3847/2041-8213/aca47e. ISSN 2041-8205. S2CID 254875671.