| Primary satellite | Secondary satellite |
| Name | Cosmos 1898 Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 18586 | 33773 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 11 09:04 | 2021 Apr 11 08:18 |
| Time of closest approach (UTC) | 2021 Mar 01 09:23:25.552 |
| Minimum distance | 7.791 km |
| Height difference | 5.857 km |
| Relative speed | 12.373 km/s |
| Angle between velocity vectors | 112° |
| Geographic position | 71.0°N, 147.0°E |
| Height | 769 km |
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