Kepler-289

Last updated
Kepler-289
Observation data
Epoch J2000.0       Equinox J2000.0
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

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.

The Kepler-289 planetary system [7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b3.70+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🜨
d5.33+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🜨
c0.49±0.02  MJ 0.51±0.03 [5] 125.8723+0.0035
−0.0021		—89.78±0.04 ° 1.002±0.019  RJ

References

  1. ↑ 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.
  2. 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.
  3. 1 2 3 4 "Kepler-289 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
  4. ↑ 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 .
  5. 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.
  6. ↑ 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.
  7. 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 .
  8. ↑ 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 .
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