| Primary satellite | Secondary satellite |
| Name | Terra | COSMOS 2251 DEB |
| Spacetrack catalog number | 25994 | 34737 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 12:28 | 2021 Jan 14 16:34 |
| Time of closest approach (UTC) | 2020 Dec 06 11:21:44.131 |
| Minimum distance | 44.867 km |
| Height difference | -4.780 km |
| Relative speed | 14.866 km/s |
| Angle between velocity vectors | 165° |
| Geographic position | 59.1°N, 153.3°E |
| Height | 713 km |
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