| Primary satellite | Secondary satellite |
| Name | Cosmos 1634 Rocket | Cosmos 1447 |
| Spacetrack catalog number | 15598 | 13916 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 15 19:05 | 2021 Jan 16 12:52 |
| Time of closest approach (UTC) | 2020 Dec 05 18:07:01.571 |
| Minimum distance | 3.230 km |
| Height difference | -1.180 km |
| Relative speed | 14.602 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 34.0°N, 73.4°E |
| Height | 965 km |
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