| Primary satellite | Secondary satellite |
| Name | PDD Test Mass | USA 426 |
| Spacetrack catalog number | 20564 | 61649 |
| Radar cross section | medium | |
| Epoch of two-line elements (UTC) | 2024 Dec 22 18:27 | 2024 Dec 18 16:56 |
| Time of closest approach (UTC) | 2024 Dec 25 01:43:48.515 |
| Minimum distance | 4.155 km |
| Height difference | 2.892 km |
| Relative speed | 10.911 km/s |
| Angle between velocity vectors | 92° |
| Geographic position | 70.1°N, 154.9°E |
| Height | 586 km |
|