| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | XY S 1 |
| Spacetrack catalog number | 15889 | 41913 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2023 Feb 01 06:47 | 2023 Feb 01 13:32 |
| Time of closest approach (UTC) | 2022 Dec 06 11:58:44.657 |
| Minimum distance | 14.515 km |
| Height difference | -3.158 km |
| Relative speed | 14.603 km/s |
| Angle between velocity vectors | 147° |
| Geographic position | 82.3°N, 18.2°E |
| Height | 521 km |
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