155 edf refractor, HGM 200 mount, 206X, 1 to 5 am CST. As I believe it covered almost the whole NW quarter and as the planet rotates E to W, the white area was consistent with the approximate every 30 year phenomenon ( it disappeared in about a hour or less) . The spot was rectangular to triangular with two rough tails and I can not remember if they were E or W. Initially I did not know what it was and excluded it from my sketch ie as i was looking for bands.
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