| Primary satellite | Secondary satellite |
| Name | Cosmos 2151 Rocket | CSL-04 DEB |
| Spacetrack catalog number | 21423 | 26423 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 04:12 | 2021 Jan 15 01:16 |
| Time of closest approach (UTC) | 2020 Dec 02 23:37:21.458 |
| Minimum distance | 42.203 km |
| Height difference | 1.970 km |
| Relative speed | 14.717 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 82.4°N, 128.9°W |
| Height | 633 km |
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