| Primary satellite | Secondary satellite |
| Name | Transit 4A | deb Delta 139 |
| Spacetrack catalog number | 116 | 12178 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2025 May 13 10:13 | 2025 May 13 13:18 |
| Time of closest approach (UTC) | 2025 Apr 18 17:34:44.598 |
| Minimum distance | 23.397 km |
| Height difference | 4.709 km |
| Relative speed | 12.846 km/s |
| Angle between velocity vectors | 122° |
| Geographic position | 66.7°N, 164.0°W |
| Height | 962 km |
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