| Primary satellite | Secondary satellite |
| Name | OBJECT D | TIANMU-1 18 |
| Spacetrack catalog number | 51949 | 58703 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2025 Nov 07 06:34 | 2025 Nov 07 06:52 |
| Time of closest approach (UTC) | 2025 Oct 18 05:35:17.327 |
| Minimum distance | 1359.372 km |
| Height difference | 6.638 km |
| Relative speed | 11.867 km/s |
| Angle between velocity vectors | 102° |
| Geographic position | 62.9°S, 173.1°W |
| Height | 514 km |
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