Comet C/2011 W3 Lovejoy in the STEREO COR2 Behind imager, as the comet disappears behind the occulting disk.
Couldn't see it by eye, too much glare around Sun from thing cloud.
Scroll down for animation of it as it skims above the Sun in the SDO imager.
Animation of comet Lovejoy as it skims near the Sun in the SDO imager (image Credit, NASA/SDO). Look carefully at centre as comet blinks in and out.
Link to larger SDO animation.