| Primary satellite | Secondary satellite |
| Name | NPP | COSMOS 2143 DEB |
| Spacetrack catalog number | 37849 | 57726 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2026 Jan 20 07:40 | 2026 Jan 19 03:15 |
| Time of closest approach (UTC) | 2025 Dec 16 04:36:59.971 |
| Minimum distance | 3.551 km |
| Height difference | 0.222 km |
| Relative speed | 14.855 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 49.0°S, 57.0°W |
| Height | 845 km |
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