| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | CICERO-8 |
| Spacetrack catalog number | 16881 | 43837 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 26 10:57 | 2021 Jan 26 06:51 |
| Time of closest approach (UTC) | 2020 Nov 29 04:19:51.607 |
| Minimum distance | 3.694 km |
| Height difference | 2.017 km |
| Relative speed | 15.161 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 41.6°S, 88.9°E |
| Height | 554 km |
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