next up previous contents
Next: The black bag around Up: JKT image quality Previous: Dust on the CCD

Dust and full moon

With full moon, stray moonlight can cause a serious shadowing effect on the dust grains on the CCD window. This will not flatfield out with twilight flats. Either dither the telescope to obtain flats while observing, or try to observe a different object, at a different part of the sky, for a while.