| Primary satellite | Secondary satellite |
| Name | STRAND 1 | Iridium 63 |
| Spacetrack catalog number | 39090 | 25286 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Mar 01 09:54 | 2021 Mar 01 14:59 |
| Time of closest approach (UTC) | 2021 Jan 21 20:05:55.699 |
| Minimum distance | 1.395 km |
| Height difference | -0.202 km |
| Relative speed | 14.800 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 68.2°S, 37.1°W |
| Height | 801 km |
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