QACITS is a python package for pointing sensing, developed primarily for the ELT/METIS instrument.

• https://qacits.readthedocs.io
• https://qacits.readthedocs.io/en/latest/demo.html This quick start guide also exists in a Jupyter notebook version: demo.ipynb

• Huby et al. 2015, Post-coronagraphic tip-tilt sensing for vortex phase masks: The QACITS technique
• Huby et al. 2017, On-sky performance of the QACITS pointing control technique with the Keck/NIRC2 vortex coronagraph
• Maire et al. 2020, Design, pointing control, and on-sky performance of the mid-infrared vortex coronagraph for the VLT/NEAR experiment