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2MASS J19383260+4603591 (commonly abbreviated to 2M J1938+4603, also known as Kepler-451) is a binary star system with at least one known planet, Kepler-451b. The system comprises two stars, a pulsating subdwarf B star as well as a small red dwarf star.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 38m 32.61s[1] |
| Declination | 46h 03m 59.1s[1] |
| Characteristics | |
| Spectral type | sdBV/M |
| Astrometry | |
| Proper motion (μ) | RA: 5.23±0.04 mas/yr[2] Dec.: -4.40±0.04 mas/yr[2] |
| Parallax (π) | 2.4400 ± 0.0316 mas[2] |
| Distance | 1,340 ± 20 ly (410 ± 5 pc) |
| Orbit[3] | |
| Period (P) | 0.12576528 d |
| Details | |
| Kepler-451 A | |
| Mass | 0.48±0.03[1] [4] M☉ |
| Radius | 0.223±0.004/0.158±0.003[1] [4] R☉ |
| Temperature | 29564±106[1][4] K |
| Age | 6±2 Gyr |
| Kepler-451 B | |
| Mass | 0.120±0.010 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
It has at least one confirmed exoplanet, Kepler-451b, discovered in 2015[6] by the Kepler spacecraft. The discovery was disputed in 2020,[3] but in 2022 confirmation of Kepler-451b and the discovery of two additional planets was announced.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d | 1.76±0.18 MJ | 0.20±0.03 | 43.0±0.1 | 0 | — | — |
| b | 1.86±0.05 MJ | 0.90±0.04 | 406±4 | 0.33±0.05 | <43[3]° | — |
| c | 1.61±0.14 MJ | 2.1±0.2 | 1460±90 | 0.29±0.07 | — | — |
References
- "2MASS J19383260+4603591 b/Kepler-451 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-09.
- Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- Krzesinski, J.; Blokesz, A.; Siwak, M.; Stachowski, G. (2020), "The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields", Astronomy & Astrophysics, 642: A105, arXiv:2009.02749, doi:10.1051/0004-6361/202038121, S2CID 221516872
- "2MASS J19383260+4603591 system". Open Exoplanet Catalog. Retrieved 2015-10-09.
- "Kepler-451". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-09.
- Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603
- Ekrem Murat Esmer; Baştürk, Özgür; Selim Osman Selam; Aliş, Sinan (2022), Detection of two additional circumbinary planets around Kepler-451, arXiv:2202.02118
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