Kepler-38
Kepler-38 is a binary star system in the constellation Lyra. These stars, called Kepler-38A and Kepler-38B have masses of 95% and 25% solar masses respectively. The brighter star is spectral class G while the secondary has spectral class M. They are separated by 0.147 AU, and complete an eccentric orbit around a common center of mass every 18.8 days.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 07m 19.2814s |
| Declination | +42° 16′ 45.120″ |
| Characteristics | |
| Spectral type | G V / M |
| Astrometry | |
| Proper motion (μ) | RA: −4.648±0.026 mas/yr Dec.: −13.159±0.025 mas/yr |
| Parallax (π) | 0.8225 ± 0.0145 mas |
| Distance | 3,970 ± 70 ly (1,220 ± 20 pc) |
| Orbit | |
| Primary | Kepler-38A |
| Companion | Kepler-38B |
| Period (P) | 18.79537 |
| Semi-major axis (a) | 0.1469 |
| Eccentricity (e) | 0.1032 |
| Details | |
| Kepler-38A | |
| Mass | 0.949 M☉ |
| Radius | 1.757 R☉ |
| Temperature | 5640 K |
| Metallicity | -0.11 |
| Kepler-38B | |
| Mass | 0.249 M☉ |
| Radius | 0.2724 R☉ |
| Metallicity | -0.11 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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