| Primary satellite | Secondary satellite |
| Name | Cosmos 1933 Rocket | ANTELSAT |
| Spacetrack catalog number | 18959 | 40034 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 11 13:39 | 2021 Apr 11 13:08 |
| Time of closest approach (UTC) | 2021 Feb 27 13:53:39.629 |
| Minimum distance | 4.418 km |
| Height difference | -2.524 km |
| Relative speed | 15.080 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 52.7°S, 88.3°W |
| Height | 645 km |
|