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We report on the discovery and analysis of a striking neutral sodium gas tail associated with comet C/1995 O1 Hale-Bopp. Sodium D–line emission has been observed at heliocentric distance r ≤ 1.4 AU in some long–period comets and the presence of neutral sodium in the tailward direction of a few bright comets has been noted, but the extent, and in particular the source, has never been clear. Here...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1847
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/8.1.11