| Primary satellite | Secondary satellite |
| Name | Cosmos 1937 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 19039 | 34388 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 18:59 | 2021 Jan 17 20:30 |
| Time of closest approach (UTC) | 2020 Nov 29 16:07:02.271 |
| Minimum distance | 36.530 km |
| Height difference | -1.791 km |
| Relative speed | 11.282 km/s |
| Angle between velocity vectors | 98° |
| Geographic position | 65.4°S, 43.8°E |
| Height | 793 km |
|