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Low CO/CO2 ratios of comet 67P measured at the Abydos landing site by the Ptolemy mass spectrometer

Morse, A.; Mouisi, O.; Sheridan, S.; Morgan, G.; Andrews, D.; Barber, S. and Wright, I. (2015). Low CO/CO2 ratios of comet 67P measured at the Abydos landing site by the Ptolemy mass spectrometer. Astronomy & Astrophysics, 583, article no. A42.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201526624
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Abstract

Comets are generally considered to contain the best-preserved material from the beginning of our planetary system, although the mechanism of their formation and subsequent evolution are still poorly understood. Here we report the direct in situ measurement of H2O, CO, and CO2 by the Ptolemy mass spectrometer onboard the Philae lander, part of the European Space Agency’s Rosetta mission, at the Abydos site of the Jupiter-family comet 67P/Churyumov-Gerasimenko. A CO/CO2 ratio of around 0.07 ± 0.04 is found at the surface of the comet, a value substantially lower than the one measured by ROSINA in the coma. Such a major difference is a potential indication of heterogeneity of the nucleus and not of changes in the CO/CO2 ratio of the coma with radial distance.

Item Type: Journal Item
Copyright Holders: 2015 ESO
ISSN: 1432-0746
Keywords: comets; space vehicles
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 44395
Depositing User: Simon Sheridan
Date Deposited: 21 Sep 2015 09:12
Last Modified: 07 Dec 2018 22:18
URI: http://oro.open.ac.uk/id/eprint/44395
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