| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 | NIUSAT |
| Spacetrack catalog number | 15889 | 42766 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2023 Feb 01 06:47 | 2023 Feb 01 12:39 |
| Time of closest approach (UTC) | 2022 Dec 01 03:32:24.010 |
| Minimum distance | 323.738 km |
| Height difference | 3.713 km |
| Relative speed | 15.112 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 76.6°S, 17.3°E |
| Height | 513 km |
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