| 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 Feb 01 06:47 | 2023 Feb 01 13:58 |
| Time of closest approach (UTC) | 2022 Dec 06 09:32:17.766 |
| Minimum distance | 2.844 km |
| Height difference | -1.045 km |
| Relative speed | 15.218 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 72.7°S, 155.3°E |
| Height | 513 km |
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