| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | SHIYAN 11 (SY-11) |
| Spacetrack catalog number | 15889 | 49501 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2023 Jan 30 23:16 | 2023 Jan 31 12:40 |
| Time of closest approach (UTC) | 2022 Dec 06 12:40:52.789 |
| Minimum distance | 17.735 km |
| Height difference | -2.701 km |
| Relative speed | 15.219 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 67.8°S, 101.7°E |
| Height | 513 km |
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