| Primary satellite | Secondary satellite |
| Name | STRAND 1 | Iridium 28 |
| Spacetrack catalog number | 39090 | 24948 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Mar 01 09:54 | 2021 Mar 01 16:18 |
| Time of closest approach (UTC) | 2021 Jan 18 05:11:36.397 |
| Minimum distance | 8.069 km |
| Height difference | -3.306 km |
| Relative speed | 13.339 km/s |
| Angle between velocity vectors | 127° |
| Geographic position | 81.4°S, 105.4°E |
| Height | 803 km |
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