| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h49m 51.6736s[1] |
| Declination | +42° 52′ 58.269″[1] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Variable type | planetary transit |
| Astrometry | |
| Proper motion (μ) | RA: 4.815(14) mas/yr[1] Dec.: −0.190(17) mas/yr[1] |
| Parallax (π) | 1.3763 ± 0.0129 mas[1] |
| Distance | 2,370 ± 20 ly (727 ± 7 pc) |
| Details | |
| Mass | 1.1[2] M☉ |
| Radius | 1.0645[2] R☉ |
| Luminosity | 0.1125588[2] L☉ |
| Temperature | 5968.88±41.9175[2] K |
| Metallicity [Fe/H] | -0.0098325 ± 0.0399191 Fe[2] dex |
| Age | 0.65±0.44[2] Gyr |
| Other designations | |
2MASS J19495168+4252582, KOI-1353, Kepler-289, KIC 7303287, PH3, TIC 273234825, WISE J194951.68+425258.2, Gaia DR2 2078515170549178880[2] | |
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 constellationofCygnus. In 2014, three exoplanets were discovered orbiting it.[2]
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.
| 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 | 0 | — | — |
| c | 0.4 MJ | 0.5 | 125.85 | 0 | — | — |
| e (unconfirmed) | ?MJ | 1.58+0.69 −0.47 |
330.071558±0.006272 | 0 | — | — |
