| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 4 |
| Spacetrack catalog number | 15944 | 43893 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 14 22:37 | 2021 Jan 14 16:14 |
| Time of closest approach (UTC) | 2020 Nov 29 21:09:29.952 |
| Minimum distance | 178.622 km |
| Height difference | 1.797 km |
| Relative speed | 15.191 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 75.6°N, 179.3°W |
| Height | 511 km |
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