| Primary satellite | Secondary satellite |
| Name | Cosmos 1727 Rocket | Cosmos 1365 |
| Spacetrack catalog number | 16511 | 13175 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2026 Jan 13 13:12 | 2026 Jan 13 10:30 |
| Time of closest approach (UTC) | 2025 Dec 20 20:37:25.479 |
| Minimum distance | 2.740 km |
| Height difference | -1.627 km |
| Relative speed | 12.529 km/s |
| Angle between velocity vectors | 117° |
| Geographic position | 56.9°S, 133.9°W |
| Height | 982 km |
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