5yleop1m t1_ixsbl5a wrote
Reply to comment by lezzet in Orion snaps 'selfie' with the Moon as it prepares for distant retrograde orbit | Insertion burn scheduled to take place today then engineers have six days to see how spacecraft fares in deep space by chrisdh79
From what I understand, the pictures with the lines are taken with the OpNav cameras which keep the space craft oriented by studying the surface of the moon.
Some info here - https://ntrs.nasa.gov/api/citations/20210000793/downloads/Orion%20Optical%20Navigation.pptx.pdf
And more details here - https://mashable.com/article/nasa-artemis-1-moon-images-pictures-orion
The cameras have to be able to see tiny feature differences, so their contrast is higher than usual. The lines could be part of the sensor or some other part of the image processing pipeline. Sometimes markers like that are used to help differentiate between different flat aspects of an image, since the lines are a known constant.
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