| Primary satellite | Secondary satellite |
| Name | Cosmos 841 Rocket | deb Delta 139 |
| Spacetrack catalog number | 9023 | 13567 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:52 | 2021 Jan 15 21:07 |
| Time of closest approach (UTC) | 2020 Nov 30 08:05:32.711 |
| Minimum distance | 3.026 km |
| Height difference | -0.849 km |
| Relative speed | 12.377 km/s |
| Angle between velocity vectors | 111° |
| Geographic position | 73.8°S, 18.1°E |
| Height | 795 km |
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