Within a few days Comet ISON is going to make a close flyby of Mars.
Will the rovers on Mars have a chance to take a look at the comet as it approaches Mars?
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There are a total of 4 Martian spacecraft that have promised to attempt a photo, according to this article.
In fact, at least HiRISE has released it's pictures. They are dim and noisy, but here they are: