| Primary satellite | Secondary satellite |
| Name | Cosmos 1816 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17360 | 47073 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 13:59 | 2024 Dec 20 23:38 |
| Time of closest approach (UTC) | 2024 Dec 25 18:39:04.894 |
| Minimum distance | 4.640 km |
| Height difference | 1.694 km |
| Relative speed | 8.814 km/s |
| Angle between velocity vectors | 74° |
| Geographic position | 73.9°N, 159.0°E |
| Height | 968 km |
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