| Primary satellite | Secondary satellite |
| Name | Cosmos 1733 | FLOCK EP 1 |
| Spacetrack catalog number | 16611 | 46813 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 20 03:53 | 2021 Jan 20 10:51 |
| Time of closest approach (UTC) | 2020 Dec 06 18:46:09.595 |
| Minimum distance | 2.990 km |
| Height difference | -0.685 km |
| Relative speed | 15.209 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 33.5°S, 140.7°W |
| Height | 522 km |
|