| Primary satellite | Secondary satellite |
| Name | Courier 1B | Cosmos 1141 Rocket |
| Spacetrack catalog number | 58 | 11586 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Feb 25 11:57 | 2021 Feb 25 12:55 |
| Time of closest approach (UTC) | 2021 Feb 02 09:29:28.880 |
| Minimum distance | 3.396 km |
| Height difference | 1.110 km |
| Relative speed | 12.036 km/s |
| Angle between velocity vectors | 109° |
| Geographic position | 11.7°N, 109.5°W |
| Height | 966 km |
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