| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 11 |
| Spacetrack catalog number | 15944 | 43904 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 10:39 | 2021 Jan 17 10:38 |
| Time of closest approach (UTC) | 2020 Dec 04 06:55:22.233 |
| Minimum distance | 13.136 km |
| Height difference | 2.253 km |
| Relative speed | 15.224 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 79.4°N, 79.7°W |
| Height | 511 km |
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