| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | Altair 2 |
| Spacetrack catalog number | 18403 | 4515 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 23 05:30 |
| Time of closest approach (UTC) | 2024 Dec 26 10:42:43.327 |
| Minimum distance | 3.475 km |
| Height difference | 0.713 km |
| Relative speed | 4.001 km/s |
| Angle between velocity vectors | 32° |
| Geographic position | 76.5°S, 158.2°E |
| Height | 1043 km |
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