| Primary satellite | Secondary satellite |
| Name | Vanguard 1 | FENGYUN 1C DEB |
| Spacetrack catalog number | 5 | 31740 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 09:33 | 2021 Jan 15 17:25 |
| Time of closest approach (UTC) | 2020 Dec 09 22:34:37.276 |
| Minimum distance | 2.212 km |
| Height difference | 1.697 km |
| Relative speed | 14.075 km/s |
| Angle between velocity vectors | 130° |
| Geographic position | 17.9°N, 17.9°E |
| Height | 789 km |
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