The Phoenix landing site
Posted by Emily Lakdawalla
25-04-2008 13:35 CDT
I have just posted an update to the Phoenix section of our website giving some basic location and description information on the Phoenix landing site. Right now the landing site is a large ellipse -- an oval 100 by 19 kilometers in size. But Phoenix is a sedentary lander, and when it comes to rest on May 25 it could be anywhere within that ellipse (though it's more likely to land near the center than close to the edge). Although no one on the mission has said as much to me (nor will they, as such things cannot be officially sanctioned by a government-run organization), I can absolutely guarantee you that somewhere in JPL, somebody is running a pool challenging people to guess where in the ellipse Phoenix will fall. The ellipse is stretched much more in the down-track direction than the across-track direction because of uncertainties in what Mars' weather holds in store for the incoming lander -- a tiny change in atmospheric temperature or density can cause the lander to decelerate more or less rapidly, which results in a landing seconds (and kilometers) earlier or later than the predicted time. I am also sure that the Phoenix mission team is glued to current weather reports from Mars, like the ones summarized in the weekly weather updates on the Mars Reconnaissance Orbiter MARCI instrument team website.It's now only 30 days from landing! Here is a neat countdown clock for the upcoming Phoenix landing, far more detailed than the usual -- it contains information on specific recent and upcoming mission milestones like rocket firings and events in the entry, descent, and landing phase of the mission. According to that site, Phoenix is at this moment just under seven million kilometers from Mars.
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