Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 01h37m 40.87964s[1] |
Declination | +12° 04′ 42.1742″[1] |
Characteristics | |
Spectral type | G3[2] |
Astrometry | |
Proper motion (μ) | RA: −0.150 mas/yr Dec.: −2.872 mas/yr |
Parallax (π) | 0.6929 ± 0.7043 mas |
Details | |
Mass | 1[2] M☉ |
Radius | 1.2 R☉ |
Temperature | 5,755[3] K |
Metallicity [Fe/H] | +0.09 ± 0.04[2] dex |
Age | 4.9[4] Gyr |
Other designations | |
Kepler-84, KOI-1589, Gaia DR2 2073776859551124992, KIC 5301750, 2MASS J19530049+4029458[1] | |
Database references | |
SIMBAD | data |
ARICNS | data |
Kepler-84 is a Sun-like star 4,700 light-years from the Sun. It is a G-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[5] The Kepler-84 star has two suspected stellar companions. Four red dwarfs are few arcseconds away and at least one is probably gravitationally bound to Kepler-84.[6] Another (which is a background star with a probability 0.5%) is a yellow star of mass 0.855M☉ on projected separations of 0.18±0.05″ or 0.26″ (213.6 AU).[7]
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[8] while the rest was confirmed in 2014.[9] To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.[10]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
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 |
d | — | 0.052 | 4.224537±0.000042 | — | — | 0.123±0.024 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 |
2012 in space
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