| Primary satellite | Secondary satellite |
| Name | NOAA 12 | Tansei-3 |
| Spacetrack catalog number | 21263 | 9841 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 11 14:33 | 2021 Apr 11 07:18 |
| Time of closest approach (UTC) | 2021 Mar 06 06:44:47.665 |
| Minimum distance | 14.120 km |
| Height difference | 0.564 km |
| Relative speed | 12.195 km/s |
| Angle between velocity vectors | 104° |
| Geographic position | 65.8°N, 7.4°E |
| Height | 826 km |
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