| Primary satellite | Secondary satellite |
| Name | Cosmos 1937 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 19039 | 35033 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 18 01:40 | 2021 Jan 17 10:06 |
| Time of closest approach (UTC) | 2020 Nov 29 11:52:08.652 |
| Minimum distance | 17.005 km |
| Height difference | -1.915 km |
| Relative speed | 13.403 km/s |
| Angle between velocity vectors | 127° |
| Geographic position | 52.1°N, 88.9°W |
| Height | 762 km |
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