Kepler-9b
Kepler-9b is one of the first planets discovered outside the solar system (exoplanets) by NASA's Kepler Mission. It revolves around the star Kepler-9 within the constellation Lyra. Kepler-9b is the largest of three planets detected in the Kepler system by transit method; its mass is roughly half that of the planet Saturn, and it is the largest planet in its system. Kepler-9b and Kepler-9c display a phenomenon called orbital resonance, in which gravitational pull from each planet alters and stabilizes the orbit of the other. The planet's discovery was announced on August 26, 2010.
Size comparison of Kepler-9b (left) with Jupiter (right) | |
| Discovery | |
|---|---|
| Discovered by | Kepler Mission team |
| Discovery site | Kepler space telescope |
| Discovery date | 26 August 2010 |
| Transit | |
| Designations | |
| KOI-377.01 | |
| Orbital characteristics | |
| 0.140 ± 0.001 AU (20,940,000 ± 150,000 km) | |
| Eccentricity | 0 |
| 19.24 d | |
| Inclination | 88.55 |
| Star | Kepler-9 |
| Physical characteristics | |
Mean radius | 0.842 ± 0.069 RJ |
| Mass | 43.5+2.7 −3.3 ME |
Mean density | 0.4±0.1 g cm−3 |
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