| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | NOAA 11 |
| Spacetrack catalog number | 15333 | 19531 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2025 May 14 10:24 | 2025 May 14 20:13 |
| Time of closest approach (UTC) | 2025 Apr 27 07:13:26.348 |
| Minimum distance | 4.567 km |
| Height difference | -2.007 km |
| Relative speed | 13.280 km/s |
| Angle between velocity vectors | 127° |
| Geographic position | 70.8°S, 134.3°E |
| Height | 873 km |
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