| Primary satellite | Secondary satellite |
| Name | Cosmos 1821 Rocket | deb Kosmos-2227 |
| Spacetrack catalog number | 17526 | 23275 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 23 19:53 | 2021 Jan 23 11:32 |
| Time of closest approach (UTC) | 2020 Nov 29 08:03:35.609 |
| Minimum distance | 5.239 km |
| Height difference | -5.236 km |
| Relative speed | 13.731 km/s |
| Angle between velocity vectors | 138° |
| Geographic position | 50.8°N, 159.4°E |
| Height | 987 km |
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