Observation of a crowded field in order to:

Definition of the pixel scale and of the angle of the true north (TN) with the aim to correctly rotate each image with the North up and the East to the left.

Definition of the distortion map (strongly needed to perform high precision relative astrometry of possible companions).

We observed the globular cluster M13. We avoided the very center of the cluster and selected a bright member (> 12 mag in R) to allow the AO system to work correctly.

HD21291 is a double star with a companion at a separation  of 2.3” with a contrast (in V) of around 3 magnitudes. Slit1 + Grism.

We performed observations of HD 21291 in order to characterize the accuracy of the slit positioning. We made several tests to infer a working “Slit pointing law”: thanks to the data acquired during night 2, we managed to derive with good accuracy the offset angle to convert any position angle on sky into a derotator position.

We performed a 3.5h observation in CI mode with the Gaussian Lyot coronagraph. The total field rotation was of 110°. The average seeing 1.2” (at zenith), with excursions below 1”. Average TT jitter 6mas rms, but sometimes loop instability with jitter values exceeding 20 mas rms. Strong wind that incremented toward the end of the observation caused a lot of open loop of the AO. So that we had to make a selection to exclude bad frames.

The four known planets of the HR 8799 were imaged. The two external ones (‘b’ and ‘c’) were retrieved with a SNR larger than 20 while for the two internal ones (‘d’ and ‘e’) the SNR was of the order of 6. The correct orientation of the FOV was correctly obtained using the keywords of the header of each image.