| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 31182 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 24 13:36 |
| Time of closest approach (UTC) | 2020 Dec 02 15:08:28.550 |
| Minimum distance | 386.926 km |
| Height difference | -1.395 km |
| Relative speed | 5.701 km/s |
| Angle between velocity vectors | 45° |
| Geographic position | 52.7°S, 127.8°W |
| Height | 879 km |
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