| Primary satellite | Secondary satellite |
| Name | SL-19 R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 37363 | 34271 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 07 18:52 | 2021 Mar 07 17:13 |
| Time of closest approach (UTC) | 2021 Jan 22 23:09:43.252 |
| Minimum distance | 745.047 km |
| Height difference | 10.836 km |
| Relative speed | 10.029 km/s |
| Angle between velocity vectors | 84° |
| Geographic position | 73.9°N, 115.9°W |
| Height | 733 km |
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