| Primary satellite | Secondary satellite |
| Name | Transit 2A | Cosmos 1266 |
| Spacetrack catalog number | 45 | 12409 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2025 May 16 12:27 | 2025 May 16 11:57 |
| Time of closest approach (UTC) | 2025 Apr 20 05:34:23.004 |
| Minimum distance | 41.599 km |
| Height difference | 0.209 km |
| Relative speed | 5.407 km/s |
| Angle between velocity vectors | 43° |
| Geographic position | 63.7°S, 13.6°W |
| Height | 945 km |
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