The night started out clear, but with the worst and most highly volatile seeing of the campaign so far. The seeing rapidly varied between 2 and 4 arcsec all night long. Skies remained clear until light scattered cirrus moved in from the west during the last three hours. These clouds may compromise some of the photometry acquired at the end of the night, but the spectropolarimetry wasn't even slowed. More clouds are forecast for tomorrow night.
Another moth worked its way into the instrument and ruined one short observation
around midnight. However, no following observation showed any evidence of the
intruder. After finishing the night, the collimator for SPOL was removed and the moth was flushed from its (thankfully) benign resting position out of the beam between the shutter and the collimator.