| Primary satellite | Secondary satellite |
| Name | Cosmos 2151 Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 21423 | 34490 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 19 16:56 | 2021 Jan 19 09:19 |
| Time of closest approach (UTC) | 2020 Dec 02 23:47:08.103 |
| Minimum distance | 10.982 km |
| Height difference | 1.872 km |
| Relative speed | 14.867 km/s |
| Angle between velocity vectors | 161° |
| Geographic position | 54.7°N, 40.3°W |
| Height | 633 km |
|