Clear, but 80% RH and T=5.6 C in dome.
Halo enormous - no sign of DS despite phase. Exposures of the BS only in the 1000's - must update exposure time - heavy clouds??
Shutter clearly open during readout - dragging downwards.
Also sticking so that saturation in stripe downwards happens - i.e. shutter started to close, then stuck open for a long time. T now at 5.2 C.
T now at 4.9 C.
Experimenting with SETIMAGEREF and MOVEMOONTOREF because it seems the mount calibratio I did earlier tonight was not quite right. Noticing that when Moon is half out of the image frame downwards I get a reflecting coming in from the upper side of the frame - like was saw during the tau Tauri occultations in July - then it was left to right. So, something in the optical train is causing reflections onto the CCD when the source is not well centered.
More and more clouds now. T now 4.8 C.