Planetary Results from the Herschel Mission Part II: TNO's are Cool!

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Scientific paper

We report on the first results of a photometric program of transneptunian objects in the thermal range, conducted on the Herschel satellite, launched in 2009. This program includes photometric measurements on about 140 TNOs or Centaurs at wavelengths ranging from 70 to 500 micron, using the PACS and SPIRE instruments of Herschel. The goals are (i) to obtain albedo and size measurements on a large sample of objects, with the aim of searching for correlations between these and other physical and orbital parameters (ii) to perform more detailed studies of thermophysical and surface properties on a smaller sample (20 objects) (iii) to infer densities for a set of binary systems (iv) to search for thermal lightcurves on a few objects showing well-marked optical lightcurves. The early results of the program will be presented.

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