Breaking: Is that a UFO Near Mercury?

A camera on board NASA's STEREO A satellite seems to have captured video of an unknown thing that looks like an actual spaceship. The blip appeared when a Sun's coronal mass ejection (CME) reached planet Mercury. Watch the video and judge by yourself.

Update: whatever it is, it appears on the images taken by STEREO twin satellite too. Check out the new video, taken at the same time, taken from the opposite side of the action.
Make sure to run the video at full screen.

What is happening in the video?
The video shows a coronal mass ejection coming from the Sun and reaching the planet Mercury. Coronal mass ejections are massive explosions of solar wind, radiation and magnetic fields that go well beyond the solar corona, deep into space. They are so big that sometimes they reach Earth.

You can see the gigantic solar wave reaching Mercury but, just as it goes through, something else becomes visible: a very angular shape that seems to be formed by two separate objects joined together. It looks as if the CME wave reveals a volume on impact, interacting with it.

You know, like a cloaked Klingon Bird of Prey being uncovered by the Sun's radioactive fury.

What captured the images?
The images—found by YouTube user siniXster in the US Navy's SECCHI site—were captured by the heliospheric imagers HI-1A on board of one the Solar TErrestrial RElations Observatories: STEREO A.

The twin STEREO spaceships were launched on October 26, 2006. They are rotating around the Sun, studying its surface and activity. They are also part of an early warning system that alerts scientists in case a CME is so strong that it may gravely disrupt satellites orbiting Earth. That's why the US Navy participates in the mission.

The heliospheric imagers are part of Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI), a ground of five cameras: a telescope that works on extreme ultraviolet, two white-light coronagraphs and the two heliospheric imagers, HI1 and HI2.

Update: the heliospheric imager from STEREO B also shows the same thing. See below.

When was it captured?
The video shows a period of 24 hours captured on December 1st, 2011. It's made of 36 frames in total.

I have repeated the 36 frames at different speeds (10 frames per second and 2 frames per second) so you can better appreciate the object and how the CME appears to interact with it.