| Primary satellite | Secondary satellite |
| Name | NPP | CSL-04 Debris |
| Spacetrack catalog number | 37849 | 25733 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2026 Jan 20 07:40 | 2026 Jan 20 02:56 |
| Time of closest approach (UTC) | 2025 Dec 16 13:12:46.184 |
| Minimum distance | 3.432 km |
| Height difference | -2.738 km |
| Relative speed | 11.625 km/s |
| Angle between velocity vectors | 103° |
| Geographic position | 75.9°S, 146.4°E |
| Height | 855 km |
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