| Primary satellite | Secondary satellite |
| Name | PEGASUS R/B | Cosmos 1666 Rocket |
| Spacetrack catalog number | 27859 | 15890 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 19:49 | 2024 Dec 23 02:26 |
| Time of closest approach (UTC) | 2024 Dec 23 20:32:33.873 |
| Minimum distance | 4.837 km |
| Height difference | -4.283 km |
| Relative speed | 12.231 km/s |
| Angle between velocity vectors | 108° |
| Geographic position | 69.1°N, 172.1°W |
| Height | 628 km |
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