| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | DELTA 1 DEB |
| Spacetrack catalog number | 11511 | 42661 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 14 06:50 | 2025 Nov 12 18:02 |
| Time of closest approach (UTC) | 2025 Oct 15 00:24:48.162 |
| Minimum distance | 15.797 km |
| Height difference | -5.728 km |
| Relative speed | 14.884 km/s |
| Angle between velocity vectors | 170° |
| Geographic position | 45.1°S, 74.3°E |
| Height | 771 km |
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