| 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 06 10:55 | 2022 Jul 06 13:28 |
| Time of closest approach (UTC) | 2022 May 22 02:55:41.070 |
| Minimum distance | 2.103 km |
| Height difference | -2.028 km |
| Relative speed | 15.218 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 70.2°S, 75.7°W |
| Height | 516 km |
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