| Primary satellite | Secondary satellite |
| Name | Cosmos 2298 Rocket | IRIDIUM 129 |
| Spacetrack catalog number | 23432 | 42958 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 16 04:04 | 2021 Jan 15 14:13 |
| Time of closest approach (UTC) | 2020 Dec 09 19:11:17.670 |
| Minimum distance | 12.496 km |
| Height difference | -7.404 km |
| Relative speed | 2.494 km/s |
| Angle between velocity vectors | 19° |
| Geographic position | 49.0°S, 35.2°W |
| Height | 803 km |
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