| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 49m 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] | |
| Database references | |
| SIMBAD | data |
Kepler-289 (PH3) is a rotatingvariablestar slightly more massive than theSun, with an unknownspectral type, 2370light-years away fromEarth in theconstellation ofCygnus. In 2014, threeexoplanets 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 theKepler space telescope and thePlanet 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 | — | — |