Bruce Murray Space Image Library

Mercury transits the EUVI field on the NASA STEREO-A satellite

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Between ~0200 and 0800UT on December 12, 2013, the Extreme UltraViolet Imager (EUVI) camera on STEREO-A witnessed Mercury pass right across the disk of the Sun, as seen in this animation. The transit was not visible from Earth as STEREO-A is on the opposite side of the Sun.