| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 32161 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Jul 17 12:08 | 2025 Jul 11 13:07 |
| Time of closest approach (UTC) | 2024 Jun 22 17:14:25.750 |
| Minimum distance | 1930.998 km |
| Height difference | -49.381 km |
| Relative speed | 14.899 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 5.0°S, 137.2°E |
| Height | 844 km |
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