Kepler-289
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 49m 51.6736s[2] |
| Declination | +42° 52′ 58.269″[2] |
| Apparent magnitude (V) | 14.14[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G2[4] |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | −18.21±5.60[2] km/s |
| Proper motion (μ) | RA: 4.815(14) mas/yr[2] Dec.: −0.190(17) mas/yr[2] |
| Parallax (π) | 1.3763±0.0129 mas[2] |
| Distance | 2,370 ± 20 ly (727 ± 7 pc) |
| Details[5] | |
| Mass | 1.08±0.02 M☉ |
| Radius | 1.00±0.02 R☉ |
| Luminosity | 1.15±0.06 L☉ |
| Surface gravity (log g) | 4.47±0.01 cgs |
| Temperature | 5990±38 K |
| Metallicity [Fe/H] | 0.05±0.04 dex |
| Age | 0.65±0.44 Gyr |
| Other designations | |
| PH3, KOI-1353, KIC 7303287, TIC 273234825, 2MASS J19495168+4252582, WISE J194951.68+425258.2[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Kepler-289 (PH3) is a rotating variable star slightly more massive than the Sun, with a spectral type of G2, 2370 light-years away from Earth in the constellation of Cygnus. It hosts a system of multiple exoplanets.[3]
Planetary system
[edit]Kepler-289 hosts three transiting planets, discovered using the Kepler space telescope. Two planets, Kepler-289b and Kepler-289c, were confirmed in 2014 as part of a study using statistical validation to confirm hundreds of Kepler candidates.[6] A third planet, Kepler-289d, was found by the Planet Hunters citizen science project, hence the other designation for the system, PH3.[5]
Different sources present conflicting models of Kepler-289's planetary system. The discovery paper for planet d says that it has an orbital period of 66 days, and that a 330-day candidate is an alias of the true period of planet d.[5] A 2023 follow-up study also reports a 66-day period for planet d.[7] However, a 2025 study reports a 330-day planet, and says that the 66-day signal "is no longer believed to exist in the data".[8] The NASA Exoplanet Archive lists both a 66-day and a 330-day planet, the latter called Kepler-289e,[3] but no literature source claims the existence of more than three planets in the system.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 3.70+3.79 −1.96 M🜨 |
0.21±0.01[5] | 34.5383±0.0006 | — | 88.98+0.06 −0.07 |
2.49±0.07 R🜨 |
| d | 5.33+0.43 −0.42 M🜨 |
0.33±0.02[5] | 66.0282+0.0044 −0.0039 |
— | 89.31±0.04 | 3.03±0.08 R🜨 |
| c | 0.49±0.02 MJ | 0.51±0.03[5] | 125.8723+0.0035 −0.0021 |
— | 89.78±0.04 | 1.002±0.019 RJ |
References
[edit]- ↑ 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.
- 1 2 3 4 5 6 7 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.
- 1 2 3 4 "Kepler-289 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
- ↑ Su, Tianhao; Zhang, Li-yun; et al. (August 2022). "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.
- 1 2 3 4 5 6 Schmitt, Joseph R.; Agol, Eric; Deck, Katherine M.; Rogers, Leslie A.; Gazak, J. Zachary; Fischer, Debra A.; Wang, Ji; Holman, Matthew J.; Jek, Kian J.; Margossian, Charles; Omohundro, Mark R. (November 2014). "Planet Hunters. VII. Discovery of a New Low-mass, Low-density Planet (PH3c) Orbiting Kepler-289 with Mass Measurements of Two Additional Planets (PH3b and d)". Astrophysical Journal. 795 (2): 167. arXiv:1410.8114. Bibcode:2014ApJ...795..167S. doi:10.1088/0004-637X/795/2/167. hdl:1721.1/93116. ISSN 0004-637X. S2CID 37872448.
- ↑ Rowe, Jason F.; Bryson, Stephen T.; et al. (March 2014). "Validation of Kepler's Multiple Planet Candidates. III. Light Curve Analysis and Announcement of Hundreds of New Multi-planet Systems". The Astrophysical Journal. 784 (1): 45. arXiv:1402.6534. Bibcode:2014ApJ...784...45R. doi:10.1088/0004-637X/784/1/45.
- 1 2 Greklek-McKeon, Michael; Knutson, Heather A.; et al. (February 2023). "Constraining the Densities of the Three Kepler-289 Planets with Transit Timing Variations". The Astronomical Journal. 165 (2): 48. arXiv:2208.00022. Bibcode:2023AJ....165...48G. doi:10.3847/1538-3881/ac8553.
- ↑ Ofir, Aviv; Yoffe, Gideon; Aharonson, Oded (February 2025). "Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset". The Astronomical Journal. 169 (2): 90. arXiv:2410.11401. Bibcode:2025AJ....169...90O. doi:10.3847/1538-3881/ad91a7.