| Primary satellite | Secondary satellite |
| Name | Cosmos 923 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 10121 | 31957 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 17 04:38 | 2021 Apr 16 16:40 |
| Time of closest approach (UTC) | 2021 Mar 06 15:39:52.169 |
| Minimum distance | 36.629 km |
| Height difference | -1.600 km |
| Relative speed | 10.629 km/s |
| Angle between velocity vectors | 91° |
| Geographic position | 71.6°S, 0.9°W |
| Height | 797 km |
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