| Primary satellite | Secondary satellite |
| Name | PDD Test Mass | FASTSAT-HSV01 (USA 220) |
| Spacetrack catalog number | 20564 | 37225 |
| Radar cross section | medium | medium |
| Epoch of two-line elements (UTC) | 2024 Dec 22 18:27 | 2024 Dec 23 05:38 |
| Time of closest approach (UTC) | 2024 Dec 25 07:01:57.968 |
| Minimum distance | 2.141 km |
| Height difference | -1.771 km |
| Relative speed | 2.368 km/s |
| Angle between velocity vectors | 18° |
| Geographic position | 8.8°N, 105.3°W |
| Height | 634 km |
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