| Primary satellite | Secondary satellite |
| Name | Oscar 19 | IRIDIUM 129 |
| Spacetrack catalog number | 20442 | 42958 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2023 Dec 05 11:30 | 2023 Dec 05 07:21 |
| Time of closest approach (UTC) | 2023 Sep 23 05:43:05.731 |
| Minimum distance | 63.608 km |
| Height difference | 5.030 km |
| Relative speed | 14.722 km/s |
| Angle between velocity vectors | 162° |
| Geographic position | 73.4°S, 171.4°W |
| Height | 800 km |
|