| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | THORAD AGENA D DEB |
| Spacetrack catalog number | 15333 | 42508 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2026 Jan 13 09:55 | 2026 Jan 12 07:59 |
| Time of closest approach (UTC) | 2025 Dec 17 20:14:02.110 |
| Minimum distance | 10.027 km |
| Height difference | 3.267 km |
| Relative speed | 14.046 km/s |
| Angle between velocity vectors | 141° |
| Geographic position | 69.7°N, 150.2°E |
| Height | 850 km |
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