Jupiter and its moons Callisto and Ganymede seen in the USNRL's LASCO C2 camera on the ESA/NASA SOHO satellite. Note that the horizontal "wings" caused by Jupiter's brightness saturating the CCD camera. These wings get smaller as Jupiter nears the solid occulting disk in the image center because of optical vignetting effects. (Vignetting can be a huge pain under most circumstances, but here it's great because it reveals Callisto and Ganymede so nicely!) As a bonus, there was also a so-called "Kreutz Sungrazer" comet earlier in the movie and a beautiful coronal mass ejection!
NASA / USNRL
Original image data dated on or about May 14, 2012.