| Primary satellite | Secondary satellite |
Name | Transit 4A | Cosmos 1861 |
Spacetrack catalog number | 116 | 18129 |
Radar cross section | medium | large |
Epoch of two-line elements (UTC) | 2021 Jan 16 04:19 | 2021 Jan 15 16:15 |
Time of closest approach (UTC) | 2020 Dec 01 13:27:33.814 |
Minimum distance | 6.579 km |
Height difference | 5.824 km |
Relative speed | 13.312 km/s |
Angle between velocity vectors | 130° |
Geographic position | 51.3°N, 81.0°W |
Height | 985 km |
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