| Primary satellite | Secondary satellite |
| Name | Cosmos 1727 Rocket | NIMBUS 2 DEB |
| Spacetrack catalog number | 16511 | 28613 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2026 Jan 13 13:12 | 2026 Jan 13 15:47 |
| Time of closest approach (UTC) | 2025 Dec 22 02:23:11.627 |
| Minimum distance | 290.046 km |
| Height difference | -2.119 km |
| Relative speed | 8.182 km/s |
| Angle between velocity vectors | 67° |
| Geographic position | 75.3°S, 154.7°E |
| Height | 989 km |
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