| Primary satellite | Secondary satellite |
| Name | Cosmos 1091 Rocket | Kosmos-1531 |
| Spacetrack catalog number | 11321 | 14624 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 10:22 | 2024 Dec 22 15:06 |
| Time of closest approach (UTC) | 2024 Dec 24 11:48:35.414 |
| Minimum distance | 4.768 km |
| Height difference | 4.435 km |
| Relative speed | 4.949 km/s |
| Angle between velocity vectors | 39° |
| Geographic position | 82.5°S, 155.5°E |
| Height | 1018 km |
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