Odyssey Arriving at Mars Tonight
moloader writes: "Odyssey will arrive at Mars on October 24, 2001, 0230 Universal Time (October 23, 7:30pm PDT/ 10:30pm EDT). As it nears its closest point to the planet over the northern hemisphere, the spacecraft will fire its 640-newton main engine for approximately 19.7 minutes to allow itself to be captured into an elliptical, or looping, orbit about 20 hours long. Go Mars!"
The Dust Storm which can dramatically change the height and density of the atmosphere, are a particular concern during aerobraking.
A great article on the whole procedure is at this link.
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