Kepler-9
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 2m 17.7544s |
| Declination | +38° 24′ 03.177″ |
| Apparent magnitude (V) | 13.9 |
| Astrometry | |
| Proper motion (μ) | RA: 2.472(13) mas/yr Dec.: −14.691(15) mas/yr |
| Parallax (π) | 1.5823±0.0120 mas |
| Distance | 2,060 ± 20 ly (632 ± 5 pc) |
| Characteristics | |
| Spectral type | G2V |
| Details | |
| Mass | 1.022+0.029 −0.039 M☉ |
| Radius | 0.958±0.020 R☉ |
| Surface gravity (log g) | 4.49+0.02 −0.03 cgs |
| Temperature | 5774±60 K |
| Metallicity [Fe/H] | +0.05±0.07 dex |
| Rotation | 16.746±0.077 days |
| Rotational velocity (v sin i) | 2.74±0.40 km/s |
| Age | 2.0+2.0 −1.3 Gyr |
| Other designations | |
| KOI-377, KIC 3323887, 2MASS J19021775+3824032 | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-9 is a sunlike star in the constellation Lyra. Its planetary system, discovered by the Kepler Mission in 2010 was the first detected with the transit method found to contain multiple planets.