| Primary satellite | Secondary satellite |
| Name | N. Korean satellite | deb Kosmos-249 |
| Spacetrack catalog number | 39026 | 3584 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Apr 15 21:33 | 2021 Apr 16 07:29 |
| Time of closest approach (UTC) | 2021 Mar 09 18:26:03.742 |
| Minimum distance | 221.523 km |
| Height difference | 2.134 km |
| Relative speed | 14.187 km/s |
| Angle between velocity vectors | 134° |
| Geographic position | 59.9°N, 172.5°E |
| Height | 491 km |
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