| Primary satellite | Secondary satellite |
| Name | NUDT-PHONESAT | EPSILON R/B |
| Spacetrack catalog number | 40900 | 43936 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Feb 25 12:39 | 2021 Feb 25 12:45 |
| Time of closest approach (UTC) | 2021 Jan 21 19:30:56.472 |
| Minimum distance | 433.515 km |
| Height difference | -3.607 km |
| Relative speed | 4.385 km/s |
| Angle between velocity vectors | 33° |
| Geographic position | 82.6°N, 107.8°W |
| Height | 513 km |
|