Diffuser assisted observations of 16 Cyg using the 3.5m telescope at Apache Point Observatory, demonstrating 62ppm precision in 30 minute bins.

This video shows the full 16 Cyg dataset as presented in Stefansson et al. 2017 (in prep; will update with link when on arxiv/published).

The two stars are observed to dance around on the detector due to residual guiding errors in the telescope.

ARCTIC has a rotator to rotate the diffuser. However, during these observations, the rotator did not work reliably, as it was difficult to rotate the diffuser bearing due to friction. This caused the diffuser to sometimes rotate and sometimes get stuck. Therefore, although the rotator was formally on, the diffuser was only sporadically rotated during the observations. This is seen in the video: the PSF speckle pattern is sometimes smoothed out. Regardless, the overall size and shape of the diffused PSF is not affected, and this has minimal effect on the resulting photometry.

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