From the Planetary Society Blog (Emily Lakdawalla):
"WD5 is approximately 50 meters in diameter, so if it did hit, it would be a good-sized bang, producing a crater about a kilometer in diameter. (This is pretty close to the size of Victoria crater, Opportunity's haunt.) Chesley estimates that such a bang happens on Mars about once every thousand years."
"However, Chesley says that this size of an impact should create a dust plume that could be detected by one of the orbiters; even the rovers could detect a change in the dust component of the sky. And of course a 1-kilometer crater would be a pretty big target for HiRISE and CRISM on Mars Reconnaissance Orbiter -- in fact, that's quite big enough to be an interesting target for all the cameras on all the orbiters at Mars. You'd probably need to spot it first with one of the lower-resolution cameras, then zero in for a detailed look with one of the higher-resolution ones."
Link: Planetary Society Blog Entry 21 December 2007: "Alert the Martian Defense Force!"
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