| Primary satellite | Secondary satellite |
| Name | deb Explorer IX | Nimbus 4 Rocket AY |
| Spacetrack catalog number | 85 | 4675 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Apr 16 12:21 | 2021 Apr 17 14:18 |
| Time of closest approach (UTC) | 2021 Feb 26 17:29:38.551 |
| Minimum distance | 3.917 km |
| Height difference | 3.182 km |
| Relative speed | 13.565 km/s |
| Angle between velocity vectors | 138° |
| Geographic position | 5.2°S, 69.8°W |
| Height | 1069 km |
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