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ASTRONIRCAM is an infrared camera-spectrograph installed at the 2.5-metertelescope of the CMO SAI. The instrument is equipped with the HAWAII-2RG array.A bad pixels classification of the ASTRONIRCAM detector is proposed. Theclassification is based on histograms of the difference of consecutivenon-destructive readouts of a flat field. Bad pixels are classified into 5groups: hot (saturated on the first readout), warm (the signal accumulationrate is above the mean value by more than 5 standard deviations), cold (therate is under the mean value by more than 5 standard deviations), dead (nosignal accumulation), and inverse (having a negative signal accumulation in thefirst readouts). Normal pixels of the ASTRONIRCAM detector account for 99.6% ofthe total. We investigated the dependence between the amount of bad pixels andthe number of cooldown cycles of the instrument. While hot pixels remain thesame, the bad pixels of other types may migrate between groups. The number ofpixels in each group stays roughly constant. We found that the mean andvariance of the bad pixels amount in each group and the transitions betweengroups do not differ noticeably between normal or slow cooldowns.

Classification of bad pixels of the Hawaii-2RG detector of the ASTROnomical NearInfraRed CAMera