Kepler-27 is a star in the northern constellation of Cygnus, the swan. It is located at the celestial coordinates: Right Ascension 19h 28m 56.81962s, Declination +41° 05′ 09.1405″.[2] With an apparent visual magnitude of 15.855,[3] this star is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 28m 56.81962s[2] |
| Declination | +41° 05′ 09.1405″[2] |
| Apparent magnitude (V) | 15.855[3] |
| Characteristics | |
| Spectral type | G5[4] |
| Astrometry | |
| Proper motion (μ) | RA: 2.171±0.033 mas/yr[2] Dec.: −0.324±0.031 mas/yr[2] |
| Parallax (π) | 0.9298 ± 0.0281 mas[2] |
| Distance | 3,500 ± 100 ly (1,080 ± 30 pc) |
| Details | |
| Mass | 0.9+0.03 −0.10[5] M☉ |
| Luminosity | 0.59[3] L☉ |
| Temperature | 5400[3] K |
| Metallicity [Fe/H] | 0.41[3] dex |
| Rotational velocity (v sin i) | 0.6[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits[5] was discovered in late 2011.[6] The planets Kepler-27b and Kepler-27c have equilibrium temperatures of 610 K and 481 K, respectively.[7] In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.[8][9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d | — | — | 6.54629 | — | — | 0.2414 RJ |
| b | 0.1320±0.018 MJ | 0.118 | 15.3348 | — | — | 0.522±0.024 RJ |
| c | 0.0670±0.011 MJ | 0.191 | 31.3309 | — | — | 0.640±0.029 RJ |
References
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