| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 10 |
| Spacetrack catalog number | 15944 | 43905 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 16:07 | 2021 Jan 25 18:12 |
| Time of closest approach (UTC) | 2020 Dec 04 00:32:17.197 |
| Minimum distance | 8.234 km |
| Height difference | 2.659 km |
| Relative speed | 15.228 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 69.6°N, 7.0°W |
| Height | 509 km |
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