| Primary satellite | Secondary satellite |
| Name | HJ-1C | FLOCK 2K 11 |
| Spacetrack catalog number | 38997 | 42894 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 11:11 | 2021 Jan 15 04:09 |
| Time of closest approach (UTC) | 2020 Dec 05 04:45:04.350 |
| Minimum distance | 296.019 km |
| Height difference | -1.284 km |
| Relative speed | 15.084 km/s |
| Angle between velocity vectors | 162° |
| Geographic position | 31.7°S, 134.2°W |
| Height | 454 km |
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