| Primary satellite | Secondary satellite |
| Name | FO-29 | deb Kosmos-397 |
| Spacetrack catalog number | 24278 | 5155 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Feb 27 19:00 | 2021 Feb 27 22:35 |
| Time of closest approach (UTC) | 2021 Jan 22 09:16:19.819 |
| Minimum distance | 96.638 km |
| Height difference | 2.225 km |
| Relative speed | 10.085 km/s |
| Angle between velocity vectors | 87° |
| Geographic position | 62.9°S, 11.6°E |
| Height | 1013 km |
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