A Population of Comets in the Main Asteroid Belt

@article{Hsieh2006APO,
  title={A Population of Comets in the Main Asteroid Belt},
  author={Henry H. Hsieh and David C. Jewitt},
  journal={Science},
  year={2006},
  volume={312},
  pages={561 - 563}
}
Comets are icy bodies that sublimate and become active when close to the Sun. They are believed to originate in two cold reservoirs beyond the orbit of Neptune: the Kuiper Belt (equilibrium temperatures of ∼40 kelvin) and the Oort Cloud (∼10 kelvin). We present optical data showing the existence of a population of comets originating in a third reservoir: the main asteroid belt. The main-belt comets are unlike the Kuiper Belt and Oort Cloud comets in that they likely formed where they currently… 
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