| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | LEMUR 2 LUCYBRYCE |
| Spacetrack catalog number | 15889 | 42773 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2022 Jul 06 10:55 | 2022 Jul 06 01:50 |
| Time of closest approach (UTC) | 2022 May 25 08:22:08.061 |
| Minimum distance | 55.587 km |
| Height difference | -1.796 km |
| Relative speed | 15.200 km/s |
| Angle between velocity vectors | 175° |
| Geographic position | 82.2°S, 78.6°W |
| Height | 518 km |
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