| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 30562 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 May 14 10:24 | 2025 May 14 20:52 |
| Time of closest approach (UTC) | 2025 Apr 29 19:01:09.080 |
| Minimum distance | 21.636 km |
| Height difference | 3.183 km |
| Relative speed | 3.613 km/s |
| Angle between velocity vectors | 28° |
| Geographic position | 10.6°S, 47.2°E |
| Height | 861 km |
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