| Primary satellite | Secondary satellite |
| Name | Cosmos 1727 Rocket | deb Kosmos-1275 |
| Spacetrack catalog number | 16511 | 12728 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2026 Jan 13 13:12 | 2026 Jan 13 13:54 |
| Time of closest approach (UTC) | 2025 Dec 22 14:45:36.890 |
| Minimum distance | 8.988 km |
| Height difference | 0.935 km |
| Relative speed | 13.767 km/s |
| Angle between velocity vectors | 139° |
| Geographic position | 69.4°S, 101.0°E |
| Height | 995 km |
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