Kepler-84
Star in the constellation Cygnus
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Kepler-84 is a Sun-like star 3,339 light-years from the Sun. It is a F-type star.[5] The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[11] The Kepler-84 star has two suspected stellar companions. Four stars, all more than four magnitudes fainter than Kepler-84, are seen within a few arcseconds and at least one is probably gravitationally bound to Kepler-84.[12] Another, which has only a 0.005% chance of being a background star, is a yellow star with mass 0.855 M☉ at a projected separation of 0.18±0.05″ or 0.26″ (213.6 AU).[13]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 53m 00.48519s[2] |
| Declination | +40° 29′ 45.9477″[2] |
| Apparent magnitude (V) | 15.03[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | F[5] |
| Astrometry | |
| Proper motion (μ) | RA: −0.150 mas/yr[2] Dec.: −2.872 mas/yr[2] |
| Parallax (π) | 0.6929±0.7043 mas[2] |
| Distance | 1,066[6] pc |
| Details[7] | |
| Mass | 1.04 M☉ |
| Radius | 1.17 R☉ |
| Luminosity | 1.77 L☉ |
| Surface gravity (log g) | 4.27 cgs |
| Temperature | 6,091 K |
| Metallicity [Fe/H] | −0.13 dex |
| Rotation | 20.21 days[8] |
| Rotational velocity (v sin i) | 4.5[9] km/s |
| Age | 5.2 Gyr |
| Other designations | |
| Kepler-84, KOI-1589, KIC 5301750, 2MASS J19530049+4029458[10] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Planetary system
Kepler-84 is orbited by five known planets, four small gas giants and a Super-Earth. Planets Kepler-84b and Kepler-84c were confirmed in 2012[14] while the rest was confirmed in 2014.[15] To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.[16]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| d | — | 0.052 | 4.224537±0.000042 | — | — | 0.123±0.024 RJ |
| b | 0.126±0.038 MJ | 0.083 | 8.725854±0.00006 | 0 | 88.24 | 0.174±0.045 RJ |
| c | 0.064±0.037 MJ | 0.108 | 12.882525±0.000093 | 0 | 88.24 | 0.184±0.047 RJ |
| e | — | 0.181 | 27.434389±0.000224 | — | — | 0.232±0.044 RJ |
| f | — | 0.25 | 44.552169±0.000812 | — | — | 0.196±0.038 RJ |