| Primary satellite | Secondary satellite |
| Name | Cosmos 1408 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 13553 | 30420 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 12 12:35 | 2021 Apr 12 11:51 |
| Time of closest approach (UTC) | 2021 Feb 28 02:50:30.441 |
| Minimum distance | 11.527 km |
| Height difference | -4.929 km |
| Relative speed | 15.126 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 40.7°S, 40.0°E |
| Height | 618 km |
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