| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 31324 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 May 14 10:24 | 2025 May 14 13:31 |
| Time of closest approach (UTC) | 2025 Apr 26 14:05:27.539 |
| Minimum distance | 3.231 km |
| Height difference | -2.301 km |
| Relative speed | 14.715 km/s |
| Angle between velocity vectors | 164° |
| Geographic position | 48.7°S, 22.5°W |
| Height | 858 km |
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