Observational Mishaps - CCD Features

List of images where the unwanted features seem to be correlated with the CCD rows or columns, or they are otherwise suspiciously electronic in appearance:

readout error: saturated strips across image.

CCD zero-level ramping: zero-level (bias) varies across image.

CCD bias frame banding due to electronic interference in the system: dark or bright bands along rows or columns on CCD.

shutter failure: bright stars have trails in the direction of the readout of the CCD.

significant dark current: image has a high level background structure which cannot be corrected for with the bias or flats.

image melting: the stars in one part of the image appear to melt, i.e., have elongated and streaky appearance; feature of the new chip 1 of the BTC.

focus frame taken during twilight: thin, bright, vertical streaks across image; stellar images only visible in a thin strip on one side of the field.

IR problems: infrared image with multiple problems: circle shaped ghost images of bright star (small and large size), wavy interference patterns, stripe across image, and dark blotches

You may also check out a list of all the compiled images, or go back to the main directory.