Planet-moon eclipse in contact with the stellar limb. (a) The planet (blue circle) and the moon (orange circle) are both in front of the star (black circle segment) and in eclipse. (b) Numerical pixel grid representing the moon. Different areas of overlap are shaded in arbitrary colors. In this specific configuration, the white area in the upper left region of the image is determined by pixel area summation and then compensated for in the light curve. The right half of the moon is not transiting.