| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 29782 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 11:40 | 2021 Jan 25 12:33 |
| Time of closest approach (UTC) | 2020 Dec 03 18:14:04.712 |
| Minimum distance | 590.220 km |
| Height difference | -5.156 km |
| Relative speed | 4.581 km/s |
| Angle between velocity vectors | 36° |
| Geographic position | 39.6°S, 172.0°E |
| Height | 872 km |
|