| Primary satellite | Secondary satellite |
| Name | Cosmos 1937 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 19039 | 33782 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 18 01:40 | 2021 Jan 17 20:13 |
| Time of closest approach (UTC) | 2020 Nov 28 00:05:31.133 |
| Minimum distance | 59.712 km |
| Height difference | -0.542 km |
| Relative speed | 8.938 km/s |
| Angle between velocity vectors | 74° |
| Geographic position | 70.2°S, 57.4°W |
| Height | 793 km |
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