| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 12 |
| Spacetrack catalog number | 15944 | 43903 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 16:07 | 2021 Jan 25 05:27 |
| Time of closest approach (UTC) | 2020 Dec 03 22:54:27.439 |
| Minimum distance | 4.812 km |
| Height difference | 3.395 km |
| Relative speed | 15.231 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 58.6°N, 9.3°E |
| Height | 505 km |
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