| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | DMC 3-FM3 |
| Spacetrack catalog number | 10096 | 40717 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:26 | 2025 Nov 17 19:43 |
| Time of closest approach (UTC) | 2025 Oct 19 20:24:03.079 |
| Minimum distance | 6.245 km |
| Height difference | -0.841 km |
| Relative speed | 15.042 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 25.5°S, 165.8°W |
| Height | 628 km |
|