| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 31210 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 25 07:55 |
| Time of closest approach (UTC) | 2020 Dec 03 23:25:18.786 |
| Minimum distance | 429.897 km |
| Height difference | 0.173 km |
| Relative speed | 6.308 km/s |
| Angle between velocity vectors | 50° |
| Geographic position | 56.9°S, 108.7°E |
| Height | 881 km |
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