| Primary satellite | Secondary satellite |
| Name | Cosmos 1634 Rocket | deb Kosmos-1275 |
| Spacetrack catalog number | 15598 | 13018 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 19:05 | 2021 Jan 15 13:31 |
| Time of closest approach (UTC) | 2020 Dec 08 13:51:02.219 |
| Minimum distance | 37.392 km |
| Height difference | -1.942 km |
| Relative speed | 9.676 km/s |
| Angle between velocity vectors | 82° |
| Geographic position | 80.6°N, 5.4°E |
| Height | 985 km |
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