| Primary satellite | Secondary satellite |
| Name | Vanguard 2 | COSMOS 1275 DEB |
| Spacetrack catalog number | 11 | 42129 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Mar 03 13:52 | 2021 Mar 01 14:48 |
| Time of closest approach (UTC) | 2021 Jan 24 00:44:32.029 |
| Minimum distance | 16.234 km |
| Height difference | 2.899 km |
| Relative speed | 11.167 km/s |
| Angle between velocity vectors | 95° |
| Geographic position | 30.3°N, 71.5°W |
| Height | 959 km |
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