| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | DMSP 5D-3 F19 DEB |
| Spacetrack catalog number | 15333 | 43415 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 25 19:13 |
| Time of closest approach (UTC) | 2020 Nov 29 03:00:58.723 |
| Minimum distance | 386.476 km |
| Height difference | 0.127 km |
| Relative speed | 4.334 km/s |
| Angle between velocity vectors | 34° |
| Geographic position | 35.9°N, 127.6°W |
| Height | 839 km |
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