| Primary satellite | Secondary satellite |
| Name | ALOS | COSMOS 2251 DEB |
| Spacetrack catalog number | 28931 | 39582 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 20:48 | 2021 Jan 05 12:29 |
| Time of closest approach (UTC) | 2020 Dec 03 21:42:48.003 |
| Minimum distance | 6.824 km |
| Height difference | -0.898 km |
| Relative speed | 14.622 km/s |
| Angle between velocity vectors | 154° |
| Geographic position | 68.3°S, 77.4°E |
| Height | 709 km |
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