Cannot detect msi camera10/9/2023 ![]() ![]() In fact, this instrument implements a statistical technique called “Variance method” (VAR) owning the potentiality to image the star field (angular resolution \(\sim 11^\). In this paper we validate a procedure to overcome this problem for the case of the innovative ASTRI telescope, developed by INAF, exploiting sky images produced as an ancillary output by its novel Cherenkov camera. As a consequence, the pointing calibration of these instruments cannot be done in general exploiting the standard astrometry of the focal plane. A peculiar aspect of Cherenkov telescopes is that they are designed to detect atmospheric light flashes on the time scale of nanoseconds, being almost blind to stellar sources.
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