ENR CTIO Blanco 4-m 2012-12-23

 Quite a good night, with a little bit of scattered cirrus passing through. Moon is waxing, and was about 84% phase this evening. 

First off, apologies for a little bit of a slow start to the observing night by DJJ -- due to fluffy-headedness or something strange in the water -- but anyway, after the pointing and focus tests, I managed to get some good observing done according to the DES exSV plan laid out by Tom D. et al. 


Observations of standard star fields were obtained near to the beginning, middle and end of the night. All of the required supernovae fields were observed, although one or two fields could not be observed in all filter dithers because the telescope was abutting the airmass limit of 2.0. 



OBSTAC observations of the SPT-E field were obtained toward the end of the night. 



End-of-night calibrations were obtained just as the Sun hit ~-10-degrees. 



Median seeing was about 1.2" all night, with a range between about 1.0-1.5", with values being (understandably) consistently worse at high airmass. 



Guider performance and ellipticity values were generally very good this evening, with poorer e-values uniformly arising from high airmass observations or the *very* occasional guider problem -- values ranged from about 0.04 to 0.08. The SISPI/Guider/TCS systems ran almost flawlessly all night ! 



I made extensive entries in the e-log this evening, so please refer to those entries for details of the targets observed. 



DJJ