| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 31769 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 14 08:02 |
| Time of closest approach (UTC) | 2020 Dec 01 11:13:43.525 |
| Minimum distance | 375.724 km |
| Height difference | -1.936 km |
| Relative speed | 9.307 km/s |
| Angle between velocity vectors | 77° |
| Geographic position | 67.8°N, 144.8°E |
| Height | 842 km |
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