Thermal infrared observations of asteroid (99942) Apophis with Herschel

  title={Thermal infrared observations of asteroid (99942) Apophis with Herschel},
  author={Thomas Muller and Cs. P. Kiss and P. Scheirich and Petr Pravec and Laurence O'Rourke and Esa Vilenius and Bruno Altieri},
  journal={Astronomy and Astrophysics},
The near-Earth asteroid (99942) Apophis is a potentially hazardous asteroid. We obtained far-infrared observations of this asteroid with the Herschel Space Observatory PACS instrument at 70, 100, and 160 mum. These were taken at two epochs in January and March 2013 during a close-Earth encounter. These first thermal measurements of Apophis were taken at similar phase angles before and after opposition. We performed a detailed thermophysical model analysis by using the spin and shape model… 

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