Kepler-4b
Kepler-4b, initially known as KOI 7.01, is an extrasolar planet first detected as a transit by the Kepler spacecraft. Its radius and mass are similar to that of Neptune; however, due to its proximity to its host star, it is substantially hotter than any planet in the Solar System. The planet's discovery was announced on January 4, 2010, in Washington, D.C., along with four other planets that were initially detected by the Kepler spacecraft and subsequently confirmed by telescopes at the W.M. Keck Observatory.
Size comparison of Neptune (left) with Kepler-4b (right). | |
| Discovery | |
|---|---|
| Discovery date | 2010-01-04 |
| Transit (Kepler Mission) | |
| Orbital characteristics | |
| 0.04558 AU (6,819,000 km) | |
| Eccentricity | 0.25 ± 0.12 |
| 3.2135 d | |
| Inclination | 89.76 |
| Star | Kepler-4 |
| Physical characteristics | |
Mean radius | 0.357 RJ 3.878 R🜨 |
| Mass | 0.077 MJ |
| Temperature | 1650 |
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