| Primary satellite | Secondary satellite |
| Name | Vanguard 1 Rocket | MKA PN2 (RELEK) |
| Spacetrack catalog number | 16 | 40070 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2026 Jan 15 10:04 | 2026 Jan 15 13:16 |
| Time of closest approach (UTC) | 2025 Dec 19 05:16:44.120 |
| Minimum distance | 51.328 km |
| Height difference | -0.989 km |
| Relative speed | 13.516 km/s |
| Angle between velocity vectors | 120° |
| Geographic position | 28.2°N, 10.2°W |
| Height | 753 km |
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