| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | DELTA 1 DEB |
| Spacetrack catalog number | 35671 | 42560 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 21 12:45 | 2024 Dec 17 05:22 |
| Time of closest approach (UTC) | 2024 Dec 29 19:46:31.850 |
| Minimum distance | 2.390 km |
| Height difference | -2.319 km |
| Relative speed | 3.748 km/s |
| Angle between velocity vectors | 29° |
| Geographic position | 34.7°N, 144.5°E |
| Height | 756 km |
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