| Primary satellite | Secondary satellite |
| Name | Cosmos 1937 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 19039 | 37990 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 18 01:40 | 2021 Jan 17 05:07 |
| Time of closest approach (UTC) | 2020 Dec 02 03:22:34.413 |
| Minimum distance | 44.970 km |
| Height difference | -3.111 km |
| Relative speed | 10.851 km/s |
| Angle between velocity vectors | 93° |
| Geographic position | 66.7°N, 50.9°E |
| Height | 772 km |
|