In a feat of astronomical and terrestrial alignment, a group of scientists from MIT (Cambridge, Mass.) and Williams College (Williamstown, Mass.) recently succeeded in observing distant Pluto’s tiny moon, Charon, hide a star. Such an event had been seen only once before, by a single telescope 25 years ago, and then not nearly as well. The MIT-Williams consortium spotted it with four telescopes in Chile on the night of July 10-11.
In addition to assessing whether Charon has an atmosphere, the team expects to get a new, accurate value for Charon’s radius and determine how round it is. The team had more than 100 square meters (about 1,000 square feet) of telescope surface facing Charon, Pluto and the star beyond them-a noticeable fraction of the world’s total telescope area.
The data and results from the recent observation will be presented at the 2005 meeting of the American Astronomical Society’s Division of Planetary Sciences meeting to be held in Cambridge, England, in September.
Elizabeth A. Thomson | MIT News Office
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