The ONC (Optical Navigation Camera) on Hayabusa2 uses a CCD to take photographs (the same as your digital camera). CCDs sometimes record false signals, especially during long exposures, and cosmic rays (high energy radiation from space) can also cause a dot or line to appear. This is called ‘noise’. Although image processing is done to remove noise, sometimes faint noise will still remain.
Article: Hayabusa2 has detected Ryugu! http://www.hayabusa2.jaxa.jp/topics/20180301_e/
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