| Primary satellite | Secondary satellite |
| Name | Transit 4A | CZ-4C R/B |
| Spacetrack catalog number | 116 | 40341 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2021 Mar 07 13:18 | 2021 Mar 07 11:41 |
| Time of closest approach (UTC) | 2021 Jan 22 10:54:49.086 |
| Minimum distance | 7.716 km |
| Height difference | -4.755 km |
| Relative speed | 8.260 km/s |
| Angle between velocity vectors | 68° |
| Geographic position | 59.6°N, 119.4°W |
| Height | 950 km |
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