| Primary satellite | Secondary satellite |
| Name | ERS-1 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 21610 | 35767 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Feb 06 19:09 | 2023 Feb 05 19:31 |
| Time of closest approach (UTC) | 2022 Dec 02 19:04:09.585 |
| Minimum distance | 535.093 km |
| Height difference | 1.557 km |
| Relative speed | 14.357 km/s |
| Angle between velocity vectors | 147° |
| Geographic position | 64.6°N, 116.8°W |
| Height | 765 km |
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