| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | DMSP 5D-2 F13 DEB |
| Spacetrack catalog number | 15333 | 42267 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 May 14 10:24 | 2025 May 10 03:15 |
| Time of closest approach (UTC) | 2025 Apr 28 16:33:35.960 |
| Minimum distance | 9.961 km |
| Height difference | 1.715 km |
| Relative speed | 14.780 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 40.4°N, 105.8°W |
| Height | 838 km |
|