About this system
The innermost, K2-21 b, circles it in 9.33 days; the outermost, K2-21 c, in 15.5 days.
Worlds of K2-21
| Name | Type | Size | A year | Temperature |
|---|---|---|---|---|
| K2-21 b | Super-Earth | 1.8 × Earth | 9.33 days | 500 K |
| K2-21 c | Sub-Neptune | 2.5 × Earth | 15.5 days | 420 K |