| Primary satellite | Secondary satellite |
| Name | ALOS | COSMOS 2251 DEB |
| Spacetrack catalog number | 28931 | 35288 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Dec 15 21:29 | 2025 Dec 15 08:15 |
| Time of closest approach (UTC) | 2024 Nov 04 02:48:32.153 |
| Minimum distance | 1036.602 km |
| Height difference | -2.552 km |
| Relative speed | 15.053 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 78.1°N, 129.7°E |
| Height | 681 km |
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