| Primary satellite | Secondary satellite |
| Name | NPP | deb Delta 139 |
| Spacetrack catalog number | 37849 | 12166 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2026 Jan 20 07:40 | 2026 Jan 20 08:02 |
| Time of closest approach (UTC) | 2025 Dec 19 15:39:16.994 |
| Minimum distance | 20.833 km |
| Height difference | -0.573 km |
| Relative speed | 10.607 km/s |
| Angle between velocity vectors | 91° |
| Geographic position | 77.3°S, 104.7°E |
| Height | 855 km |
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