| Primary satellite | Secondary satellite |
| Name | AIST 2D | COSMOS 2251 DEB |
| Spacetrack catalog number | 41465 | 34723 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Feb 25 11:34 | 2021 Feb 25 13:52 |
| Time of closest approach (UTC) | 2021 Jan 17 12:47:15.970 |
| Minimum distance | 522.799 km |
| Height difference | 11.026 km |
| Relative speed | 15.066 km/s |
| Angle between velocity vectors | 161° |
| Geographic position | 48.6°S, 129.6°E |
| Height | 470 km |
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