| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 30516 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 25 22:26 |
| Time of closest approach (UTC) | 2020 Dec 02 10:58:06.413 |
| Minimum distance | 253.518 km |
| Height difference | 3.016 km |
| Relative speed | 8.173 km/s |
| Angle between velocity vectors | 67° |
| Geographic position | 64.2°N, 133.7°E |
| Height | 842 km |
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