| Primary satellite | Secondary satellite |
| Name | Courier 1B | Cosmos 1447 |
| Spacetrack catalog number | 58 | 13916 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2026 Jan 21 16:17 | 2026 Jan 22 11:44 |
| Time of closest approach (UTC) | 2025 Dec 20 11:01:39.006 |
| Minimum distance | 15.487 km |
| Height difference | 1.438 km |
| Relative speed | 12.162 km/s |
| Angle between velocity vectors | 110° |
| Geographic position | 7.4°N, 122.0°W |
| Height | 960 km |
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