| Primary satellite | Secondary satellite |
| Name | Terra | COSMOS 2251 DEB |
| Spacetrack catalog number | 25994 | 37327 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 12:28 | 2021 Jan 14 17:23 |
| Time of closest approach (UTC) | 2020 Dec 05 02:27:46.431 |
| Minimum distance | 42.171 km |
| Height difference | -1.967 km |
| Relative speed | 14.438 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 71.7°N, 85.1°W |
| Height | 716 km |
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