| Primary satellite | Secondary satellite |
| Name | USA 229 DEB | FENGYUN 1C DEB |
| Spacetrack catalog number | 37391 | 33601 |
| Radar cross section | | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 19:06 | 2021 Apr 12 04:53 |
| Time of closest approach (UTC) | 2021 Mar 04 16:31:08.852 |
| Minimum distance | 13.721 km |
| Height difference | 0.267 km |
| Relative speed | 14.566 km/s |
| Angle between velocity vectors | 161° |
| Geographic position | 15.6°N, 121.0°E |
| Height | 969 km |
|