| Primary satellite | Secondary satellite |
| Name | Transit 2A Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 47 | 34006 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 16:47 | 2021 Jan 24 18:12 |
| Time of closest approach (UTC) | 2020 Dec 08 04:07:00.657 |
| Minimum distance | 173.362 km |
| Height difference | 0.847 km |
| Relative speed | 4.759 km/s |
| Angle between velocity vectors | 37° |
| Geographic position | 66.2°N, 14.1°E |
| Height | 738 km |
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