Kepler-289

Kepler-289
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cygnus
Right ascension	19h 49m 51.6736s
Declination	+42° 52′ 58.269″
Characteristics
Evolutionary stage	main sequence star
Variable type	planetary transit
Astrometry
Proper motion (μ)	RA: 4.815(14) mas/yr ; Dec.: −0.190(17) mas/yr
Parallax (π)	1.3763 ± 0.0129 mas
Distance	2,370 ± 20 ly ; (727 ± 7 pc)
Details
Mass	1.1 M☉
Radius	1.0645 R☉
Luminosity	0.1125588 L☉
Temperature	5968.88±41.9175 K
Metallicity [Fe/H]	-0.0098325 ± 0.0399191 Fe dex
Age	0.65±0.44 Gyr
Other designations
	2MASS J19495168+4252582, KOI-1353, Kepler-289, KIC 7303287, PH3, TIC 273234825, WISE J194951.68+425258.2, Gaia DR2 2078515170549178880

Kepler-289 (PH3) is a rotating variable star slightly more massive than the Sun, with an unknown spectral type, 2370 light-years away from Earth in the constellation of Cygnus. In 2014, three exoplanets were discovered orbiting it.^[2]

Planetary system

Kepler-289 hosts four planets, three confirmed (Kepler-289b,^[3]^[4]^[5]^[6] Kepler-289c,^[7]^[3]^[8] Kepler-289d^[3]^[9]^[10]) 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.

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

References

^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h "Kepler-289 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
^ ^a ^b ^c 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.
^ "Kepler-289 b". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
^ "The Extrasolar Planet Encyclopaedia — Kepler-289b". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.
^ 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.
^ "The Extrasolar Planet Encyclopaedia — Kepler-289c". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.
^ "Kepler-289 c". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
^ "Kepler-289 d". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-02-11.
^ "The Extrasolar Planet Encyclopaedia — Kepler-289d". Extrasolar Planets Encyclopaedia. Retrieved 10 September 2023.