| Primary satellite | Secondary satellite |
| Name | Vanguard 2 Rocket | IRIDIUM 164 |
| Spacetrack catalog number | 12 | 43577 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2026 Jan 19 07:07 | 2026 Jan 19 06:46 |
| Time of closest approach (UTC) | 2025 Dec 06 20:19:02.293 |
| Minimum distance | 284.120 km |
| Height difference | -11.762 km |
| Relative speed | 8.236 km/s |
| Angle between velocity vectors | 64° |
| Geographic position | 26.1°N, 66.4°W |
| Height | 793 km |
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