| Primary satellite | Secondary satellite |
| Name | Vanguard 2 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 12 | 35435 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2023 Nov 30 03:28 | 2023 Nov 24 02:35 |
| Time of closest approach (UTC) | 2023 Sep 26 17:08:48.617 |
| Minimum distance | 1599.482 km |
| Height difference | 73.269 km |
| Relative speed | 10.150 km/s |
| Angle between velocity vectors | 81° |
| Geographic position | 32.9°S, 135.8°E |
| Height | 656 km |
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