| Primary satellite | Secondary satellite |
| Name | GP-B | SL-18 DEB |
| Spacetrack catalog number | 28230 | 35359 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 17:38 | 2021 Jan 17 16:44 |
| Time of closest approach (UTC) | 2020 Dec 03 16:37:27.725 |
| Minimum distance | 224.437 km |
| Height difference | -2.103 km |
| Relative speed | 14.758 km/s |
| Angle between velocity vectors | 156° |
| Geographic position | 47.4°N, 47.8°W |
| Height | 642 km |
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