| Primary satellite | Secondary satellite |
| Name | ALOS | COSMOS 2251 DEB |
| Spacetrack catalog number | 28931 | 35672 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 12 21:24 | 2021 Apr 12 12:06 |
| Time of closest approach (UTC) | 2021 Mar 04 08:48:10.891 |
| Minimum distance | 89.290 km |
| Height difference | -0.574 km |
| Relative speed | 6.025 km/s |
| Angle between velocity vectors | 47° |
| Geographic position | 59.2°N, 95.0°E |
| Height | 695 km |
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