Inspired by this I tried a reordering of the connections to the USB2.0 and USB3.0 ports of the RPi4. I moved the USB3.0 cable which feeds the 7-port USB3.0 powered hub to one of the RPi4 USB2.0 ports. I connected the two USB3.0 devices, the SSD and the ASI camera, directly to the RPi4 USB3.0 ports, and the other devices to the USB powered hub, presumably now operating as USB2.0. This was not helpful, in this arrangement lsusb didn’t list any Bus 001 (USB2.0) devices, only three Bus 002 devices, the SSD, ASI camera and the RPi4 USB3.0 hub.
AradoSKYindi wrote: With both hubs under USB 2.0, all systems are good. No faults are presented. UT is not right time zone. KSTARS knows where it is. GOTO is working fine. I imagine if all devices were USB 3.0, then nothing would be said.