| Primary satellite | Secondary satellite |
| Name | Cosmos 1733 | Tandem-X |
| Spacetrack catalog number | 16611 | 36605 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 26 11:47 | 2021 Jan 25 23:41 |
| Time of closest approach (UTC) | 2020 Dec 08 19:32:20.516 |
| Minimum distance | 256.565 km |
| Height difference | 3.335 km |
| Relative speed | 13.721 km/s |
| Angle between velocity vectors | 129° |
| Geographic position | 80.5°S, 79.9°E |
| Height | 532 km |
|