| Primary satellite | Secondary satellite |
| Name | ADEOS Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 24279 | 34304 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 21:46 | 2021 Apr 11 18:12 |
| Time of closest approach (UTC) | 2021 Mar 05 09:21:32.013 |
| Minimum distance | 6.877 km |
| Height difference | -2.545 km |
| Relative speed | 14.826 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 54.8°N, 97.8°W |
| Height | 873 km |
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