The trans-neptunian object UB313 is larger than Pluto

F. Bertoldi (), W. Altenhoff, A. Weiss, K.M. Menten and C. Thum
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F. Bertoldi: University of Bonn
W. Altenhoff: Max-Planck-Institute for Radioastronomy
A. Weiss: Max-Planck-Institute for Radioastronomy
K.M. Menten: Max-Planck-Institute for Radioastronomy
C. Thum: IRAM

Nature, 2006, vol. 439, issue 7076, 563-564

Abstract: One over the nine The discovery of the trans-neptunian object 2003 UB313 in July 2005 has rekindled the debate over which objects should be called planets. Popularly but not officially known as the ‘tenth planet’, its optical brightness suggests it is larger than Pluto, but without knowing its surface reflectivity (albedo) it is not possible to determine size from optical data. But now a pretty accurate measure of its size has be made, based on thermal emission data obtained using the IRAM 30-metre radio telescope at Pico Veleta, Spain. UB313 is about 3,000 km in diameter, compared to Pluto's 2,000 km. Its albedo is similar to Pluto's, consistent with a highly reflective icy surface rich in methane.

Date: 2006
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DOI: 10.1038/nature04494

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