| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | RAPIS-1 |
| Spacetrack catalog number | 16881 | 43932 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 27 15:33 | 2021 Jan 27 19:54 |
| Time of closest approach (UTC) | 2020 Nov 30 23:00:22.669 |
| Minimum distance | 300.284 km |
| Height difference | -4.510 km |
| Relative speed | 14.363 km/s |
| Angle between velocity vectors | 143° |
| Geographic position | 80.5°S, 43.2°E |
| Height | 571 km |
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