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Ptolemy operations and results during the Lutetia flyby

Andrews, D. J.; Morse, A. D.; Barber, S. J.; Leese, M. R.; Morgan, G. H.; Sheridan, S.; Zarnecki, J. C.; Pillinger, C. T. and Wright, I. P. (2012). Ptolemy operations and results during the Lutetia flyby. Planetary And Space Science, 66 pp. 179–186.

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The September 5th 2008 Rosetta flyby of asteroid 2867 Šteins raised tantalising questions concerning the possibility of outgassing and extant exospheres surrounding small bodies within the asteroid belt. With this in mind and recognising the size and composition of asteroid 21 Lutetia it was decided to attempt a detection of such possible outgassing using a number of Rosetta instruments, including Ptolemy, a miniature gas chromatograph isotope ratio mass spectrometer aboard the lander Philae. Ptolemy collected 5 sets of mass spectra at hourly intervals during the Lutetia encounter; 2 background measurements either side of close approach and an exosphere detection measurement as the spacecraft passed over the subsolar point. An increase in pressure was detected at the subsolar point but the cause (exosphere or spacecraft) was unresolved with the realisation that any such detection is hindered by outgassing from the spacecraft and instrument itself. Constraints are placed on the properties of Lutetia exosphere, structure and production rates. The experience gained is used to provide suggestions for future missions or spacecraft events aimed at the detection and characterisation of the exospheres of Solar System bodies.

Item Type: Journal Item
Copyright Holders: 2011 Elsevier B.V.
ISSN: 0032-0633
Keywords: Rosetta; Ptolemy; 21 Lutetia; asteroid; comet; exosphere
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Item ID: 28819
Depositing User: Dan Andrews
Date Deposited: 01 Feb 2012 17:28
Last Modified: 08 Dec 2018 13:30
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