| Primary satellite | Secondary satellite |
| Name | MOZHAYETS 4 | deb Kosmos-990 |
| Spacetrack catalog number | 27939 | 18501 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Mar 07 18:02 | 2021 Mar 07 12:46 |
| Time of closest approach (UTC) | 2021 Jan 19 09:20:43.346 |
| Minimum distance | 1.413 km |
| Height difference | -1.164 km |
| Relative speed | 14.917 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 51.1°S, 68.5°E |
| Height | 698 km |
|