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The abundance of deuterium in the atmosphere of [[Jupiter]] has been directly measured by the [[Galileo space probe]] as 26 atoms per million hydrogen atoms. ISO-SWS observations find 22 atoms per million hydrogen atoms in Jupiter.<ref>{{Cite journal |author=Lellouch, E |year=2001 |title=The deuterium abundance in Jupiter and Saturn from ISO-SWS observations |journal=[[Astronomy & Astrophysics]] |volume=670 |pages=610–622 |doi=10.1051/0004-6361:20010259 |last2=Bézard |first2=B. |last3=Fouchet |first3=T. |last4=Feuchtgruber |first4=H. |last5=Encrenaz |first5=T. |last6=De Graauw |first6=T. |bibcode=2001A&A...370..610L |issue=2 |url=http://www.aanda.org/articles/aa/pdf/2001/17/aa10609.pdf}}</ref> and this abundance is thought to represent close to the primordial solar system ratio.<ref name="Hersant" /> This is about 17% of the terrestrial deuterium-to-hydrogen ratio of 156 deuterium atoms per million hydrogen atoms.<!--News reports of Hubble measurements of "6 atoms of D per 10,000" in Jupiter are wrong; the correct figure is 6 parts D per 100,000 by weight, which is 30 parts per million atom-fraction, close to the Galileo result of 26 parts per million, atom-fraction-->
 
Cometary bodies such as [[Comet Hale -Bopp]] and [[Halley's Comet]] have been measured to contain relatively more deuterium (about 200 atoms D per million hydrogens), ratios which are enriched with respect to the presumed protosolar nebula ratio, probably due to heating, and which are similar to the ratios found in Earth seawater. The recent measurement of deuterium amounts of 161 atoms D per million hydrogen in Comet [[103P/Hartley]] (a former [[Kuiper belt]] object), a ratio almost exactly that in Earth's oceans, emphasizes the theory that Earth's surface water may be largely comet-derived.<ref name="nature2"/><ref name="Hersant"/> Most recently the deuterium/protium (D/H) ratio of [[67P/Churyumov–Gerasimenko]] as measured by ''Rosetta'' is about three times that of Earth water, a figure that is high.<ref name="sciencemag.org"/> This has caused renewed interest in suggestions that Earth's water may be partly of asteroidal origin.
 
Deuterium has also observed to be concentrated over the mean solar abundance in other terrestrial planets, in particular Mars and Venus.