| Primary satellite | Secondary satellite |
| Name | Cosmos 1538 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 14760 | 33762 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 11:37 | 2024 Dec 23 03:49 |
| Time of closest approach (UTC) | 2024 Dec 27 09:44:01.484 |
| Minimum distance | 2.215 km |
| Height difference | 1.917 km |
| Relative speed | 12.139 km/s |
| Angle between velocity vectors | 109° |
| Geographic position | 62.0°N, 20.4°E |
| Height | 781 km |
|