| Primary satellite | Secondary satellite |
| Name | FENGYUN 1C DEB | Cosmos 1777 Rocket |
| Spacetrack catalog number | 36188 | 16953 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 20 04:41 | 2024 Dec 23 03:34 |
| Time of closest approach (UTC) | 2024 Dec 26 07:00:13.424 |
| Minimum distance | 1.533 km |
| Height difference | 0.337 km |
| Relative speed | 14.741 km/s |
| Angle between velocity vectors | 162° |
| Geographic position | 62.6°N, 82.3°E |
| Height | 777 km |
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