| Primary satellite | Secondary satellite |
| Name | Cosmos 1140 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 11574 | 34576 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Sep 28 13:40 | 2023 Sep 28 06:44 |
| Time of closest approach (UTC) | 2023 Jun 10 04:12:19.926 |
| Minimum distance | 4138.841 km |
| Height difference | 0.900 km |
| Relative speed | 10.757 km/s |
| Angle between velocity vectors | 92° |
| Geographic position | 50.2°S, 25.4°E |
| Height | 763 km |
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