| Primary satellite | Secondary satellite |
| Name | Transit 2A Rocket | Cosmos 1538 |
| Spacetrack catalog number | 47 | 14759 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 25 10:07 | 2021 Jan 25 15:22 |
| Time of closest approach (UTC) | 2020 Dec 09 05:53:06.727 |
| Minimum distance | 17.471 km |
| Height difference | -1.252 km |
| Relative speed | 4.948 km/s |
| Angle between velocity vectors | 39° |
| Geographic position | 66.5°S, 159.5°E |
| Height | 790 km |
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