| Primary satellite | Secondary satellite |
| Name | Cosmos 2251 Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 22676 | 34497 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 12:10 | 2021 Jan 17 10:59 |
| Time of closest approach (UTC) | 2020 Nov 26 21:36:34.481 |
| Minimum distance | 49.730 km |
| Height difference | 6.090 km |
| Relative speed | 8.853 km/s |
| Angle between velocity vectors | 72° |
| Geographic position | 74.1°N, 96.0°E |
| Height | 779 km |
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