| Primary satellite | Secondary satellite |
| Name | Cosmos 1898 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 18586 | 36678 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 09:04 | 2021 Apr 09 20:54 |
| Time of closest approach (UTC) | 2021 Mar 06 03:50:20.098 |
| Minimum distance | 13.546 km |
| Height difference | -5.702 km |
| Relative speed | 14.235 km/s |
| Angle between velocity vectors | 146° |
| Geographic position | 72.0°S, 31.6°E |
| Height | 805 km |
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