| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | YAOGAN 11 |
| Spacetrack catalog number | 10096 | 37165 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 15 11:35 | 2021 Jan 15 04:44 |
| Time of closest approach (UTC) | 2020 Dec 06 13:44:24.922 |
| Minimum distance | 3.800 km |
| Height difference | 3.663 km |
| Relative speed | 15.035 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 43.3°N, 1.8°W |
| Height | 637 km |
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