| Primary satellite | Secondary satellite |
| Name | Cosmos 1680 Rocket | MAST |
| Spacetrack catalog number | 16012 | 31126 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 06:07 | 2021 Apr 11 07:34 |
| Time of closest approach (UTC) | 2021 Mar 03 01:18:46.954 |
| Minimum distance | 4.085 km |
| Height difference | 2.605 km |
| Relative speed | 14.807 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 54.7°N, 12.9°E |
| Height | 770 km |
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