| Primary satellite | Secondary satellite |
| Name | STRAND 1 | IRIDIUM 140 |
| Spacetrack catalog number | 39090 | 43252 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Mar 01 09:54 | 2021 Mar 01 17:02 |
| Time of closest approach (UTC) | 2021 Jan 18 11:44:00.945 |
| Minimum distance | 5.746 km |
| Height difference | -0.775 km |
| Relative speed | 14.854 km/s |
| Angle between velocity vectors | 171° |
| Geographic position | 58.2°S, 96.2°E |
| Height | 800 km |
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