| Primary satellite | Secondary satellite |
| Name | Cosmos 923 Rocket | deb Delta 139 |
| Spacetrack catalog number | 10121 | 13827 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 13 05:20 | 2021 Apr 12 11:35 |
| Time of closest approach (UTC) | 2021 Mar 09 01:24:58.810 |
| Minimum distance | 19.959 km |
| Height difference | -0.883 km |
| Relative speed | 11.872 km/s |
| Angle between velocity vectors | 105° |
| Geographic position | 73.5°N, 73.4°E |
| Height | 781 km |
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