| Primary satellite | Secondary satellite |
| Name | Cosmos 2181 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 21903 | 30981 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 21:07 | 2021 Apr 16 06:18 |
| Time of closest approach (UTC) | 2021 Mar 03 22:45:24.388 |
| Minimum distance | 2.016 km |
| Height difference | -1.972 km |
| Relative speed | 14.690 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 65.5°S, 100.4°E |
| Height | 978 km |
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