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Some static maps made from the interactive site, including overview maps of the path across Mexico and the US. The green line is the predicted central line, while the blue lines are the predicted limits of the occultation; the asteroid is expected to be only 7 km across, subtending only 0.019”. The blue lines are 18 km apart, both because of projection of the shadow on the Earth’s surface, but more due to the angular diameter of the star, causing a partial occultation to be visible over a larger area (more on that later). More important in this case are the red lines; they are where the outer limits could be in case of a 1-sigma error in the path, shifting either east or west. With the current prediction, there is only a 7% chance of an occultation at the central line, while this probability falls to 4% at the red “1-sigma” lines. In order to ensure that the occultation is observed, to about 84% certainty, it will be necessary to have observers, or observing stations, spread at, at most, 18-km intervals across the entire 218-km distance between the two red lines; preferably, the spacing would be 9 km or less, so that at least 2 stations record at least a partial occultation of the star. Then, 25 stations are needed to cover the uncertainty zone well enough to have a high probability of success.

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