| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | deb Kosmos-1275 |
| Spacetrack catalog number | 15333 | 18601 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 May 14 10:24 | 2025 May 13 13:39 |
| Time of closest approach (UTC) | 2025 Apr 30 22:54:32.094 |
| Minimum distance | 10.021 km |
| Height difference | 0.205 km |
| Relative speed | 14.321 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 33.3°N, 155.9°E |
| Height | 835 km |
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