| Primary satellite | Secondary satellite |
| Name | N. Korean satellite | Cosmos 1633 |
| Spacetrack catalog number | 39026 | 15592 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2021 Apr 13 05:12 | 2021 Apr 13 02:32 |
| Time of closest approach (UTC) | 2021 Mar 10 20:53:44.729 |
| Minimum distance | 182.492 km |
| Height difference | 2.606 km |
| Relative speed | 4.935 km/s |
| Angle between velocity vectors | 38° |
| Geographic position | 66.0°N, 73.5°W |
| Height | 473 km |
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