| Primary satellite | Secondary satellite |
| Name | Cosmos 1308 Rocket | COSMOS 1275 DEB |
| Spacetrack catalog number | 12836 | 42182 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 16 18:00 | 2025 Nov 14 16:18 |
| Time of closest approach (UTC) | 2025 Oct 18 23:58:10.507 |
| Minimum distance | 5.879 km |
| Height difference | -1.457 km |
| Relative speed | 14.512 km/s |
| Angle between velocity vectors | 159° |
| Geographic position | 48.5°S, 66.6°W |
| Height | 978 km |
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