| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 Rocket | PEGASUS R/B |
| Spacetrack catalog number | 15890 | 27859 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 16:44 | 2024 Dec 22 19:49 |
| Time of closest approach (UTC) | 2024 Dec 23 20:32:33.888 |
| Minimum distance | 4.914 km |
| Height difference | 4.291 km |
| Relative speed | 12.231 km/s |
| Angle between velocity vectors | 108° |
| Geographic position | 69.1°N, 172.1°W |
| Height | 624 km |
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