| Primary satellite | Secondary satellite |
| Name | SL-08 R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 27561 | 35671 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 12:41 | 2024 Dec 21 12:45 |
| Time of closest approach (UTC) | 2024 Dec 25 18:55:03.267 |
| Minimum distance | 3.495 km |
| Height difference | -0.881 km |
| Relative speed | 14.929 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 2.8°N, 1.1°E |
| Height | 734 km |
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