| Primary satellite | Secondary satellite |
| Name | DOVE 4 | SMOS |
| Spacetrack catalog number | 39430 | 36036 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Mar 05 04:39 | 2021 Mar 05 00:01 |
| Time of closest approach (UTC) | 2021 Jan 17 17:33:20.218 |
| Minimum distance | 124.078 km |
| Height difference | -3.309 km |
| Relative speed | 11.456 km/s |
| Angle between velocity vectors | 100° |
| Geographic position | 77.9°N, 148.3°E |
| Height | 776 km |
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