12.8 degrees C in dome at start – 45 F outside on MLO mast
9 m/s increasing at start. At xxx.86 the wind is 16 ms or 20 mph. Steady from South.
Exposure factors for the filters are very good this night:
These are factors, note xposure times. The exposure time is some number times the above. A typical IRCUT exposure time may be 0.008 s. The code we have – script_builder_MOON.pro – scales a table like the above one appropriately for the lunar phase.
Later: The above factors seem inadequate on another night with the Moon rising – B is overexposed while VE1, VE2 and IRCUT are at 12000. Hmmm.
A bit later still: Hmmm – the above problem was due to hanging shutter – but a very consistently hanging shutter! So the table is OK. B is perhaps a bit high but now V and VE2 are just right.