| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | deb Delta 139 |
| Spacetrack catalog number | 11511 | 13570 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 16 13:57 |
| Time of closest approach (UTC) | 2020 Nov 30 01:58:30.228 |
| Minimum distance | 6.103 km |
| Height difference | 4.882 km |
| Relative speed | 14.906 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 28.8°N, 132.4°W |
| Height | 767 km |
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