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首页> 外文期刊>Planetary and space science >Interpretation of COSAC mass spectrometer data acquired during Rosetta's Lutetia fly-by 10 July 2010
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Interpretation of COSAC mass spectrometer data acquired during Rosetta's Lutetia fly-by 10 July 2010

机译：解释2010年7月10日之前在罗塞塔（Rosetta）的Lutetia飞行中获得的COSAC质谱仪数据

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摘要

On 10 July 2010 the Rosetta spacecraft flew-by asteroid Lutetia. At that time all the mass spectrometers in the payload of the Philae Lander capable of gas analysis were in operation. Among these, the COSAC (Cometary Sampling and Composition) experiment is a gas-chromatograph mass spectrometer which was switched on twice during the fly-by, once 3h prior to Closest Approach for 126 s and 1 h afterwards for 126 s. The instrument performed well and two mass spectra were obtained from which the composition of the gas phase was evaluated. These spectra show no evidence of the presence of an exosphere at Lutetia. The most likely interpretation of the records is that traces of residual gas from Philae and from COSAC itself were recorded, with a slight change in composition between the two measurements. A mean upper pressure limit inside COSAC derived from the two measurements is of the order of 5 × 10~(-9) mbar. This is the highest limit quoted by the various onboard instruments but is explicable in the context that COSAC was designed to operate in environments characterized by relatively higher pressure. The COSAC results are in line with those of the other Rosetta instruments that made measurements during the fly-by (see other papers in this issue).
机译：2010年7月10日，罗塞塔号航天器飞越小行星Lutetia。那时，Philae Lander有效载荷中所有能够进行气体分析的质谱仪都在运行。其中，COSAC（Cometary采样和组成）实验是一种气相色谱质谱仪，在飞行过程中两次打开，在最接近方法之前3h开启126 s，然后在1 h开启126 s。该仪器运行良好，获得了两个质谱图，从中可以评估气相的组成。这些光谱没有显示出在Lutetia存在外层大气的证据。对记录的最可能的解释是，记录到了来自Philae和中远空运中心本身的残留气体的痕迹，两次测量之间的成分略有变化。从这两次测量得出的COSAC内部平均压力上限约为5×10〜（-9）mbar。这是各种车载仪器所引用的最高限制，但在中远空运专为在相对较高压力的环境中运行而设计的情况下可以解释为最高限制。 COSAC的结果与在飞越过程中进行测量的其他Rosetta仪器的结果一致（请参阅本期其他论文）。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.187-191|共5页
  • 作者

    Fred Goesmann; Susan McKenna-Lawlor; Reinhard Roll; Jan Hendrik Bredehoeft; Uwe Meierhenrich; Francois Raulin; Wolfram Thiemann; Guillermo M. Mufioz Caro; Cyril Szopa;

  • 作者单位

    Max Planck Institute for Solar System Research, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany;

    Space Technology Ireland, National University of Ireland, Maynooth, Co. Kildare, Ireland;

    Max Planck Institute for Solar System Research, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany;

    Institute for Applied and Physical Chemistry, University of Bremen, Leobener Str., 28359 Bremen, Germany;

    University of Nice-Sophia Antipolis, LCMBA UMR 6001 CNRS, Pare Valrose, F-06108 Nice;

    Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), UMR CNRS 7583, Universite Paris Est Creteil et Universite Paris Diderot, Institut Pierre Simon Laplace,C.M.C., 61 avenue du General de Gaulle, 94010 Creteil Cedex, France;

    Inst. Physikal. und Umweltchemie, FB 02 Universitaet Bremen, Leobener Str. D 28359 Bremen, Germany;

    Centra de Astrobiologia (CSIC-INTA), Ctra. de Ajalvir, km 4, Torrejon de Ardoz, 28850 Madrid, Spain;

    UPMC Univ. Paris 06, Universite Versailles St-Quentin, CNRS/INSU, LATMOS-1PSL, 4 place Jussieu, 75005 Paris Cedex, France;

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  • 正文语种 eng
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  • 关键词

    rosetta; philae; COSAC; lutetia;

    机译：莲座丛;philae;中远集团;黄体;

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