| Primary satellite | Secondary satellite |
| Name | PROBA | Cosmos 921 |
| Spacetrack catalog number | 26958 | 10095 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2025 Dec 05 06:07 | 2025 Dec 05 00:21 |
| Time of closest approach (UTC) | 2025 Nov 20 13:20:08.034 |
| Minimum distance | 49.752 km |
| Height difference | 2.120 km |
| Relative speed | 12.982 km/s |
| Angle between velocity vectors | 119° |
| Geographic position | 76.2°S, 153.2°W |
| Height | 610 km |
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