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Nature 399, 640-641 (17 June 1999) | doi:10.1038/21326

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Comets:  Putting the CO in coma

Jacques Crovisier1

When comet Hale-Bopp was at its closest to the Sun (roughly 0.9AU, where 1AU = 1 astronomical unit, the Earth-to-Sun distance) at the beginning of April 1997, it released about 300 tons of water and 100 tons of carbon monoxide (CO) per second.

  1. Jacques Crovisier is at the Observatoire de Paris, F-92195 Meudon, France.
    e-mail: Email:  jacques.crovisier@obspm.fr