| 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) | 2026 Jan 22 01:50 | 2026 Jan 21 02:25 |
| Time of closest approach (UTC) | 2025 Apr 18 17:19:35.889 |
| Minimum distance | 4396.707 km |
| Height difference | -32.148 km |
| Relative speed | 13.626 km/s |
| Angle between velocity vectors | 136° |
| Geographic position | 49.0°N, 131.6°E |
| Height | 975 km |
|