Entering orbit…
| Yours | GJ 15 A b | |
|---|---|---|
| Mass | 3.60 × Earth | 3.03 × Earth |
| Radius | 1.44 × Earth | 1.55 × Earth |
| Density (composition) | 6.63 g/cm³ | 4.48 g/cm³ |
| Temperature | 637.6 K | 550.0 K |
| Starlight received | 2.16 × Earth | 4.27 × Earth |
| Star temperature | 5,600 K | 3,607 K |
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Small and distant: a quiet, stable companion.
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).