Alessandro Morichetta
Analysis and design of algorithms for astrometric data reduction.
Rel. Bartolomeo Montrucchio, Monica Visintin, Deborah Busonero. Politecnico di Torino, Corso di laurea magistrale in Ict For Smart Societies (Ict Per La Società Del Futuro), 2018
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Abstract
In December 2013 Gaia satellite was launched by ESA (European Space Agency). Since the start of the nominal operations in mid 2014 the instrument is collecting all-sky images of our galaxy. During its five years of operation the satellite will detect a billion of celestial objects with the objective of calculating with accuracies up to tens of microsecond of arc, for each of them, the fundamental astrometric parameters: position, proper motion and parallaxes. The scientific instruments is made of two identical telescopes pointing two fields of view separated by an angle of 106.5° which share a common focal plane. The focal plane is made of 106 CCDs, of which 62 are devoted to astrometry.
Each CCD works in TDI (time delayed integration) in synch with the scanning motion of the satellite, collecting small windows (12x18 pixels) around each observed star
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