| Primary satellite | Secondary satellite |
| Name | Cosmos 2221 Rocket | PDD Test Mass |
| Spacetrack catalog number | 22237 | 20565 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2026 Jan 16 13:36 | 2026 Jan 16 08:23 |
| Time of closest approach (UTC) | 2025 Dec 08 10:42:35.219 |
| Minimum distance | 163.627 km |
| Height difference | 0.077 km |
| Relative speed | 13.744 km/s |
| Angle between velocity vectors | 131° |
| Geographic position | 78.8°N, 15.8°E |
| Height | 635 km |
|