SPHERE IRDIS and IFS astrometric strategy and calibration
SPHERE IRDIS and IFS astrometric strategy and calibration
We present the current results of the astrometric characterization of the VLT planet finder SPHERE over 2 years of on-sky operations. We first describe the criteria for the selection of the astrometric fields used for calibrating the science data: binaries, multiple systems, and stellar clusters. The analysis includes measurements of …