| Primary satellite | Secondary satellite |
| Name | Terra | COSMOS 2251 DEB |
| Spacetrack catalog number | 25994 | 34453 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 11:33 | 2021 Jan 15 18:38 |
| Time of closest approach (UTC) | 2020 Dec 04 13:12:50.468 |
| Minimum distance | 88.920 km |
| Height difference | -3.730 km |
| Relative speed | 5.945 km/s |
| Angle between velocity vectors | 47° |
| Geographic position | 58.5°N, 125.8°E |
| Height | 713 km |
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