| Primary satellite | Secondary satellite |
| Name | Okean-O | deb Kosmos-397 |
| Spacetrack catalog number | 25860 | 5155 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 07:33 | 2021 Apr 11 06:22 |
| Time of closest approach (UTC) | 2021 Mar 04 18:41:15.899 |
| Minimum distance | 65.848 km |
| Height difference | -6.931 km |
| Relative speed | 15.025 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 8.4°N, 8.8°E |
| Height | 643 km |
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