| Primary satellite | Secondary satellite |
| Name | Okean-O | COSMOS 2251 DEB |
| Spacetrack catalog number | 25860 | 34679 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 12 19:20 | 2021 Apr 12 12:55 |
| Time of closest approach (UTC) | 2021 Mar 05 06:07:18.607 |
| Minimum distance | 26.902 km |
| Height difference | -0.736 km |
| Relative speed | 15.048 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 19.5°N, 164.4°W |
| Height | 643 km |
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