| Primary satellite | Secondary satellite |
| Name | Cosmos 1674 | FLOCK 3K 9 |
| Spacetrack catalog number | 15944 | 43906 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 10:39 | 2021 Jan 17 10:48 |
| Time of closest approach (UTC) | 2020 Dec 05 03:28:36.396 |
| Minimum distance | 5.990 km |
| Height difference | 2.597 km |
| Relative speed | 15.219 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 81.5°N, 13.0°W |
| Height | 512 km |
|