| Primary satellite | Secondary satellite |
| Name | SKYMED 3 | HODOYOSHI 4 |
| Spacetrack catalog number | 33412 | 40011 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 16 05:05 | 2021 Apr 16 04:00 |
| Time of closest approach (UTC) | 2021 Mar 05 23:29:24.802 |
| Minimum distance | 230.890 km |
| Height difference | -2.527 km |
| Relative speed | 7.537 km/s |
| Angle between velocity vectors | 60° |
| Geographic position | 81.5°N, 26.9°E |
| Height | 637 km |
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