| Primary satellite | Secondary satellite |
| Name | ERS-1 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 21610 | 35979 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Feb 06 04:09 | 2023 Feb 04 21:30 |
| Time of closest approach (UTC) | 2022 Dec 02 12:31:57.664 |
| Minimum distance | 549.811 km |
| Height difference | -12.384 km |
| Relative speed | 14.836 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 38.1°N, 30.1°W |
| Height | 760 km |
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