Cometary Isotopic Measurements
نویسندگان
چکیده
منابع مشابه
Stardust Isotopic Compositions of Cometary Matter Returned
http://www.sciencemag.org/cgi/content/full/314/5806/1724 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/314/5806/1724/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http:/...
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Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Nonterrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except...
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The quasi-simultaneous arrival (QSA) effect has been tested with the Cameca NanoSIMS 50. The capability of obtaining rather large values of K (ratio of secondary ions ejected per primary ions) has been used to follow the evolution of QSA over a large range of K value by changing the collection efficiency. The amplitude of the effect associated with QSA has been determined and compared to the th...
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متن کاملCometary Diversity and Cometary Families 1.1 Introduction
Comets are classified from their orbital characteristics into two separate classes: nearly-isotropic, mainly long-period comets and ecliptic, short-period comets. Members from the former class are coming from the Oort cloud. Those of the latter class were first believed to have migrated from the Kuiper belt where they could have been accreted in situ, but recent orbital evolution simulations sh...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2015
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-015-0156-9