| Primary satellite | Secondary satellite |
| Name | SL-16 R/B | deb Delta |
| Spacetrack catalog number | 28353 | 21374 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 14 05:40 | 2021 Apr 14 10:19 |
| Time of closest approach (UTC) | 2021 Mar 08 21:34:27.348 |
| Minimum distance | 27.851 km |
| Height difference | 4.165 km |
| Relative speed | 13.274 km/s |
| Angle between velocity vectors | 125° |
| Geographic position | 71.1°N, 67.5°E |
| Height | 861 km |
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