| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | Orbcomm 28 |
| Spacetrack catalog number | 11511 | 25482 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 10 05:17 | 2021 Apr 09 15:04 |
| Time of closest approach (UTC) | 2021 Mar 06 15:29:07.392 |
| Minimum distance | 12.388 km |
| Height difference | 1.807 km |
| Relative speed | 6.039 km/s |
| Angle between velocity vectors | 48° |
| Geographic position | 40.9°N, 107.0°E |
| Height | 779 km |
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