| Primary satellite | Secondary satellite |
| Name | Transit 2A Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 47 | 34116 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2026 Jan 13 12:11 | 2026 Jan 13 13:48 |
| Time of closest approach (UTC) | 2025 Dec 17 15:41:37.232 |
| Minimum distance | 607.349 km |
| Height difference | -2.987 km |
| Relative speed | 1.084 km/s |
| Angle between velocity vectors | 8° |
| Geographic position | 4.4°S, 149.4°W |
| Height | 723 km |
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