Mark R Leese

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On the basis of previous ground-based and fly-by information, we knew that Titan's atmosphere was mainly nitrogen, with some methane, but its temperature and pressure profiles were poorly constrained because of uncertainties in the detailed composition. The extent of atmospheric electricity ('lightning') was also hitherto unknown. Here we report the(More)
The entry, descent and landing of ExoMars offer a rare (once-permission) opportunity to perform in situ investigation of the martian environment over a wide altitude range. We present an initial assessment of the atmospheric science that can be performed using sensors of the Entry, Descent and Landing System (EDLS), over and above the expected engineering(More)
The surface of Saturn's largest satellite--Titan--is largely obscured by an optically thick atmospheric haze, and so its nature has been the subject of considerable speculation and discussion. The Huygens probe entered Titan's atmosphere on 14 January 2005 and descended to the surface using a parachute system. Here we report measurements made just above and(More)
The Surface Science Package (SSP) consists of nine independent subsystems with the primary aim of characterising Titan's surface at the end of Huygens' descent through Titan's atmosphere in late 2004. In addition, many useful atmospheric measurements will be made during the descent phase. Seven of the subsystems are mounted inside or on the lower rim of a(More)
In May 2014, the Rosetta spacecraft is scheduled to rendezvous with the comet Churyumov-Gerasimenko ('67P'). One of the instruments on board the 'Lander' which will descend on to the surface of the comet is a miniaturised GC/MS system that incorporates an ion trap mass spectrometer, specially developed for isotope ratio analysis. This article describes the(More)
Introduction: On 14 th January 2005 the Huygens probe landed on the surface of Titan, a culmination of many years work. There were six major instruments onboard, designed primarily for atmospheric measurements. Further details of the Huygens Probe and the instruments can be found in the ESA publication SP-1177. Initial results and interpretation from the(More)
Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Ptolemy: Operations to date as part of the Rosetta mission and plans for the comet encounter.
Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. a b s t r a c t Objective: Characterize and understand acoustic instrument performance on the surface of Titan.(More)
Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical(More)
Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Abstract The ExoMars Trace Gas Orbiter (TGO) will have the capability of detecting and characterizing a broad suite(More)