| Primary satellite | Secondary satellite |
| Name | N. Korean satellite | FLOCK 4A 16 |
| Spacetrack catalog number | 39026 | 44099 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Apr 13 05:12 | 2021 Apr 13 03:20 |
| Time of closest approach (UTC) | 2021 Mar 10 10:45:53.176 |
| Minimum distance | 388.307 km |
| Height difference | 1.254 km |
| Relative speed | 8.430 km/s |
| Angle between velocity vectors | 67° |
| Geographic position | 80.0°S, 131.1°W |
| Height | 514 km |
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