| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | Burner II No. 5 |
| Spacetrack catalog number | 10096 | 2985 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 15 11:35 | 2021 Jan 15 09:16 |
| Time of closest approach (UTC) | 2020 Dec 02 17:56:27.528 |
| Minimum distance | 5.885 km |
| Height difference | -0.126 km |
| Relative speed | 14.931 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 69.5°N, 25.8°W |
| Height | 639 km |
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