| Primary satellite | Secondary satellite |
| Name | Vanguard 2 | FENGYUN 1C DEB |
| Spacetrack catalog number | 11 | 29874 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 04:12 | 2021 Jan 15 16:09 |
| Time of closest approach (UTC) | 2020 Dec 01 23:34:37.681 |
| Minimum distance | 133.191 km |
| Height difference | 18.586 km |
| Relative speed | 13.737 km/s |
| Angle between velocity vectors | 131° |
| Geographic position | 5.6°N, 107.2°W |
| Height | 917 km |
|