| Primary satellite | Secondary satellite |
| Name | Cosmos 1825 | OBJECT K |
| Spacetrack catalog number | 17566 | 43858 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 03 08:28 | 2021 Mar 03 15:16 |
| Time of closest approach (UTC) | 2021 Jan 20 11:30:00.557 |
| Minimum distance | 63.869 km |
| Height difference | -4.408 km |
| Relative speed | 4.461 km/s |
| Angle between velocity vectors | 34° |
| Geographic position | 82.3°S, 58.3°E |
| Height | 530 km |
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