| Primary satellite | Secondary satellite |
| Name | ALOS | COSMOS 2251 DEB |
| Spacetrack catalog number | 28931 | 33830 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 17 20:48 | 2021 Jan 17 21:11 |
| Time of closest approach (UTC) | 2020 Dec 05 21:14:07.137 |
| Minimum distance | 6.962 km |
| Height difference | 1.508 km |
| Relative speed | 14.920 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 50.0°S, 95.3°E |
| Height | 702 km |
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