| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 8 |
| Spacetrack catalog number | 15944 | 43901 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 10:39 | 2021 Jan 17 17:23 |
| Time of closest approach (UTC) | 2020 Dec 07 21:51:22.990 |
| Minimum distance | 42.079 km |
| Height difference | -0.397 km |
| Relative speed | 15.184 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 82.4°N, 104.7°E |
| Height | 515 km |
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