SECCHI Uncovers What? Near Mercury

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DoggerDan
Interesting video. Nice stop-action at 2:12 min.

I don't believe in aliens, so what might this actually be?

Mercury's day side is hot enough (upwards of 800 deg F) to create some serious off-gassing. It's surface gravity is significant at 0.38 g, but it has no atmosphere to speak of.

Could this illuminated "object" merely be the front edge of a gas cloud to the sunward side of the planet? If not, what else might it be?
 
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