| Primary satellite | Secondary satellite |
| Name | Cosmos 1842 | Tandem-X |
| Spacetrack catalog number | 17911 | 36605 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2023 Dec 03 13:39 | 2023 Dec 03 11:47 |
| Time of closest approach (UTC) | 2023 Oct 03 07:37:03.831 |
| Minimum distance | 119.110 km |
| Height difference | -4.445 km |
| Relative speed | 15.203 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 70.6°N, 5.4°W |
| Height | 527 km |
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