| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 3 |
| Spacetrack catalog number | 15944 | 43892 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 16:07 | 2021 Jan 25 19:29 |
| Time of closest approach (UTC) | 2020 Dec 03 22:48:54.976 |
| Minimum distance | 5.357 km |
| Height difference | 2.004 km |
| Relative speed | 15.235 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 37.9°N, 4.2°E |
| Height | 500 km |
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