| Primary satellite | Secondary satellite |
| Name | Kosmos-1308 | Cosmos 1821 Rocket |
| Spacetrack catalog number | 12835 | 17526 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 03:25 | 2024 Dec 22 20:01 |
| Time of closest approach (UTC) | 2024 Dec 29 21:38:14.705 |
| Minimum distance | 3.161 km |
| Height difference | 1.886 km |
| Relative speed | 8.336 km/s |
| Angle between velocity vectors | 69° |
| Geographic position | 81.4°N, 156.1°W |
| Height | 982 km |
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