| Primary satellite | Secondary satellite |
| Name | Cosmos 1634 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 15598 | 32211 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 19:05 | 2020 Dec 25 05:14 |
| Time of closest approach (UTC) | 2020 Dec 07 06:26:48.310 |
| Minimum distance | 4.514 km |
| Height difference | 0.683 km |
| Relative speed | 11.584 km/s |
| Angle between velocity vectors | 104° |
| Geographic position | 80.1°N, 115.2°E |
| Height | 986 km |
|