| Primary satellite | Secondary satellite |
| Name | Cosmos 158 Rocket | Cosmos 371 |
| Spacetrack catalog number | 2802 | 4578 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 18 02:45 | 2021 Apr 18 04:25 |
| Time of closest approach (UTC) | 2021 Mar 09 04:31:54.530 |
| Minimum distance | 10.181 km |
| Height difference | 1.656 km |
| Relative speed | 8.599 km/s |
| Angle between velocity vectors | 70° |
| Geographic position | 70.4°S, 135.5°W |
| Height | 736 km |
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