| Primary satellite | Secondary satellite |
| Name | Transit 2A | PACE |
| Spacetrack catalog number | 45 | 40022 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Feb 27 18:25 | 2021 Feb 27 18:44 |
| Time of closest approach (UTC) | 2021 Jan 27 11:19:59.777 |
| Minimum distance | 2.176 km |
| Height difference | -0.050 km |
| Relative speed | 14.978 km/s |
| Angle between velocity vectors | 160° |
| Geographic position | 37.2°N, 14.5°E |
| Height | 611 km |
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