| Primary satellite | Secondary satellite |
| Name | Terra | COSMOS 2251 DEB |
| Spacetrack catalog number | 25994 | 35891 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 22 19:06 | 2021 Jan 20 12:24 |
| Time of closest approach (UTC) | 2020 Nov 29 20:35:43.182 |
| Minimum distance | 26.097 km |
| Height difference | 0.976 km |
| Relative speed | 14.771 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 60.0°S, 43.0°E |
| Height | 725 km |
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