Direct measurement of the size of 2003 UB313

Details Direct measurement of the size of 2003 UB313 Direct measurement of the size of 2003 UB313

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10759b&link_type=abstract

HST Proposal ID #10759

Physics

Hst Proposal Id #10759 Solar System

Scientific paper

We propose observations ito directly measure the size of the newly discovered object 2003 UB313. The observations are identical to those used to successfully measure the size of the minor planet {50000} Quaoar and have a high chance of obtaining the first concrete size measurement of this object. Even for an absurdly high albedo of 96% this object is larger than Pluto. For more reasonable albedos the object could be as large as 1.5 times Pluto. At a distance of 97 AU a Pluto-sized object would subtend 32 milliarcseconds, well within our previously estimate limit of 20 milliarcseconds for accurate measurement. For a more reasonable Pluto-like albedo the object would subtend 42 millarcseconds, essentially identical to Quaoar, which was successfully resolved by our team several years ago. The direct measurement will be the cornerstone of the size measurement of this object, which will also include radiometric observations from Spitzer, IRAM, and the CSO. We anticipate a single thorough analysis using all available means to get the best true size measurement possible.

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