Kepler-289

Kepler-289 (PH3) is a star slightly more massive than the Sun, with an unknown spectral type, 2300 light-years away from Earth. In 2014, three planets were discovered orbiting it. [1]

Kepler-289
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 49m 51.68s [1]
Declination +42° 52′ 58.27″ [1]
Characteristics
Evolutionary stage main sequence star
Variable type planetary transit
Astrometry
Proper motion (μ) RA: 4.7788 ± 0.0294139 [1] mas/yr
Dec.: -0.2374610 ± 0.0303047 [1] mas/yr
Parallax (π)1.39093 ± 0.0176152 [1] mas
Details
Mass1.1 [1] M☉
Radius1.0645 [1] R☉
Luminosity0.1125588 [1] L☉
Temperature5968.88±41.9175 [1] K
Metallicity [Fe/H]-0.0098325 ± 0.0399191 Fe [1] dex
Age0.65±0.44 [1] Gyr
Other designations
2MASS J19495168+4252582, KOI-1353, Kepler-289, KIC 7303287, PH3, TIC 273234825, WISE J194951.68+425258.2, Gaia DR2 2078515170549178880 [1]

Planetary system

Kepler-289 hosts four planets, three confirmed (Kepler-289b [2][3][4][5], Kepler-289c [6][2][7], Kepler-289d [2][8][9]) and one unconfirmed candidate (Kepler-289e). The discovery of this system was made using the transit method. The inner three planets were found in 2014 with the Kepler space telescope and the Planet Hunters team, while planet e was discovered by follow-up studies in 2017. As of 2023, planet d's eccentricity is not yet known.

The Kepler-289 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.04±0.002 MJ 0.2 34.545 0 — —
d 0.01 MJ 0.3 66.1  ? — —
c 0.4 MJ 0.5 125.85 0 — —
e (unconfirmed)  ? MJ 1.58+0.69
−0.47		 330.071558±0.006272 0 — —

References
  1. "Kepler-289 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
  2. 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.
  3. "Kepler-289 b". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
  4. "The Extrasolar Planet Encyclopaedia — Kepler-289b". exoplanet.eu. Retrieved 10 September 2023.
  5. Zacharias, N.; Finch, C.; Subasavage, J.; Bredthauer, G.; Crockett, C.; Divittorio, M.; Ferguson, E.; Harris, F.; Harris, H.; Henden, A.; Kilian, C. (October 2015). "The First U.S. Naval Observatory Robotic Astrometric Telescope Catalog". The Astronomical Journal. 150 (4): 101. arXiv:1508.04637. Bibcode:2015AJ....150..101Z. doi:10.1088/0004-6256/150/4/101. ISSN 0004-6256. S2CID 32535965.
  6. "The Extrasolar Planet Encyclopaedia — Kepler-289c". exoplanet.eu. Retrieved 10 September 2023.
  7. "Kepler-289 c". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
  8. "Kepler-289 d". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
  9. "The Extrasolar Planet Encyclopaedia — Kepler-289d". exoplanet.eu. Retrieved 10 September 2023.
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