| Primary satellite | Secondary satellite |
| Name | PACE | Prospero |
| Spacetrack catalog number | 40022 | 5580 |
| Radar cross section | small | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 12 19:07 | 2021 Apr 13 01:48 |
| Time of closest approach (UTC) | 2021 Mar 04 12:45:52.993 |
| Minimum distance | 2.812 km |
| Height difference | -2.812 km |
| Relative speed | 15.254 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 68.6°S, 158.9°E |
| Height | 625 km |
|