| Primary satellite | Secondary satellite |
| Name | PROBA | COSMOS 2251 DEB |
| Spacetrack catalog number | 26958 | 34464 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2025 Dec 05 06:07 | 2025 Dec 04 16:32 |
| Time of closest approach (UTC) | 2025 Nov 19 12:43:55.866 |
| Minimum distance | 647.225 km |
| Height difference | 13.538 km |
| Relative speed | 15.116 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 75.0°N, 78.6°W |
| Height | 521 km |
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