| Primary satellite | Secondary satellite |
| Name | USA 308 | SL-18 DEB |
| Spacetrack catalog number | 45876 | 40050 |
| Radar cross section | | small |
| Epoch of two-line elements (UTC) | 2021 Mar 02 18:08 | 2021 Mar 05 22:04 |
| Time of closest approach (UTC) | 2021 Jan 21 02:39:57.678 |
| Minimum distance | 356.978 km |
| Height difference | 5.655 km |
| Relative speed | 12.756 km/s |
| Angle between velocity vectors | 114° |
| Geographic position | 35.6°S, 7.2°W |
| Height | 585 km |
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