| Primary satellite | Secondary satellite |
| Name | Vanguard 2 | COSMOS 2251 DEB |
| Spacetrack catalog number | 11 | 40223 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2023 Oct 03 03:34 | 2023 Oct 03 06:50 |
| Time of closest approach (UTC) | 2023 Jun 14 09:00:00.808 |
| Minimum distance | 8655.886 km |
| Height difference | -1113.537 km |
| Relative speed | 13.829 km/s |
| Angle between velocity vectors | 146° |
| Geographic position | 21.0°N, 87.8°W |
| Height | 1810 km |
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