| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | OBJECT B |
| Spacetrack catalog number | 15889 | 53949 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2023 Feb 01 06:47 | 2023 Feb 01 14:47 |
| Time of closest approach (UTC) | 2022 Dec 02 00:44:06.291 |
| Minimum distance | 40.049 km |
| Height difference | 1.522 km |
| Relative speed | 15.218 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 78.8°N, 132.5°E |
| Height | 517 km |
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