About this system
The innermost, Kepler-399 b, circles it in 14.4 days; the outermost, Kepler-399 d, in 58 days.
Worlds of Kepler-399
| Name | Type | Size | A year | Temperature |
|---|---|---|---|---|
| Kepler-399 b | Earth-sized | 0.96 × Earth | 14.4 days | 773 K |
| Kepler-399 c | Super-Earth | 1.4 × Earth | 26.7 days | 630 K |
| Kepler-399 d | Super-Earth | 1.9 × Earth | 58 days | 486 K |