| Primary satellite | Secondary satellite |
| Name | Transit 4A | FENGYUN 1C DEB |
| Spacetrack catalog number | 116 | 30857 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Jan 22 17:16 | 2021 Jan 22 18:30 |
| Time of closest approach (UTC) | 2020 Nov 29 07:16:56.256 |
| Minimum distance | 183.420 km |
| Height difference | -6.851 km |
| Relative speed | 12.010 km/s |
| Angle between velocity vectors | 108° |
| Geographic position | 66.9°S, 105.2°W |
| Height | 890 km |
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