| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | deb Kosmos-1275 |
| Spacetrack catalog number | 15333 | 12658 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 11:40 | 2021 Jan 25 10:31 |
| Time of closest approach (UTC) | 2020 Dec 01 03:50:33.159 |
| Minimum distance | 984.488 km |
| Height difference | 1.518 km |
| Relative speed | 2.611 km/s |
| Angle between velocity vectors | 20° |
| Geographic position | 45.2°S, 179.3°E |
| Height | 871 km |
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