| Primary satellite | Secondary satellite |
| Name | ERS-1 Rocket | IRIDIUM 169 |
| Spacetrack catalog number | 21610 | 43926 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2023 Jan 29 02:52 | 2023 Jan 29 03:36 |
| Time of closest approach (UTC) | 2022 Dec 02 14:42:49.586 |
| Minimum distance | 144.372 km |
| Height difference | 2.638 km |
| Relative speed | 14.741 km/s |
| Angle between velocity vectors | 162° |
| Geographic position | 70.2°S, 93.3°W |
| Height | 783 km |
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