| Primary satellite | Secondary satellite |
| Name | Cosmos 1400 Rocket | HXMT |
| Spacetrack catalog number | 13403 | 42758 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Feb 25 20:51 | 2021 Feb 26 02:42 |
| Time of closest approach (UTC) | 2021 Jan 21 19:27:02.082 |
| Minimum distance | 224.094 km |
| Height difference | 1.486 km |
| Relative speed | 9.096 km/s |
| Angle between velocity vectors | 74° |
| Geographic position | 44.1°S, 140.9°E |
| Height | 547 km |
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