Kepler-4
Kepler-4 is a sunlike star located about 1626 light-years away in the constellation Draco. It is in the field of view of the Kepler Mission, a NASA operation purposed with finding Earth-like planets. Kepler-4b, a Neptune-sized planet that orbits extremely close to its star, was discovered in its orbit and made public by the Kepler team on January 4, 2010. Kepler-4b was the first discovery by the Kepler satellite, and its confirmation helped to demonstrate the spacecraft's effectiveness.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 19h 2m 27.6980s |
| Declination | +50° 8′ 08.704″ |
| Apparent magnitude (V) | 12.7 |
| Characteristics | |
| Spectral type | G0 |
| Astrometry | |
| Proper motion (μ) | RA: 6.127(12) mas/yr Dec.: 4.642(13) mas/yr |
| Parallax (π) | 2.0055 ± 0.0103 mas |
| Distance | 1,626 ± 8 ly (499 ± 3 pc) |
| Details | |
| Mass | 1.117+0.021 −0.029 M☉ |
| Radius | 1.555±0.012 R☉ |
| Luminosity | 2.505+0.142 −0.124 L☉ |
| Surface gravity (log g) | 4.102+0.005 −0.004 cgs |
| Temperature | 5781±76 K |
| Metallicity [Fe/H] | 0.09±0.10 dex |
| Age | 6.71+0.77 −0.67 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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