Matt and I went out to the observatory tonight. Transparency was below average. We mounted the spectrograph around 8 pm (after initializing the telescope to the set star). As we discussed earlier, we changed the focus of the telescope slowly, but both the motor and the computer stopped responding when the focus was around 3200 [Task manager was on the desktop all the time]. The ambient temperature was 3.1 F. The star was on the slit, when I checked the focus at 3100.
Archive for December, 2012
I observed a couple of variable stars whose periods are unknown or not well determined. Conditions were good, but cold, around -8F. There were a lot of cosmic rays in the images tonight–I haven’t noticed them nearly as much other nights as tonight.