| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | BIROS |
| Spacetrack catalog number | 15889 | 41604 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2022 Jul 03 11:54 | 2022 Jul 03 13:00 |
| Time of closest approach (UTC) | 2022 May 22 01:22:39.884 |
| Minimum distance | 1.892 km |
| Height difference | -1.805 km |
| Relative speed | 15.218 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 67.4°S, 55.2°W |
| Height | 516 km |
|