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首页> 外文期刊>Planetary and space science >Thermal and shape properties of asteroid (21) Lutetia from Herschel observations around the Rosetta flyby
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Thermal and shape properties of asteroid (21) Lutetia from Herschel observations around the Rosetta flyby

机译：小行星（21）Lutetia的热学和形状特性，来自Rosetta飞越附近的Herschel观测

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摘要

Prior to and around the Rosetta flyby of (21) Lutetia, the Herschel Space Observatory performed a collaborative observation campaign with its two photometers observing the asteroid in the far infrared, at wavelengths not covered by Rosetta's instruments. The Herschel observations, fed into a thermo-physical model (TPM) using as input a shape model based on in-situ images, were also further correlated with ～70 multi-wavelength observations of Lutetia. We confirm the geometric albedo measured by Rosetta, derive a H-mag value based upon the effective diameter of the asteroid and point to (21) Lutetia having an extremely low thermal inertia (5J m~(-2) s~(-0.5) K~(-1)). This thermal inertia is only possible through the existence of a significant amount of small scale roughness which is not directly observable by the OSIRIS (Optical, Spectroscopic, and Infrared Imaging System) instrument on-board Rosetta. In addition, our results point to the existence of a hill/crater surface feature located on the asteroids southern region not observed by Rosetta. From our results, we conclude that only through the merging of in situ and remote sensing observations can a true global picture be obtained of this asteroid.
机译：在（21）Lutetia的罗塞塔飞越之前和周围，赫歇尔太空天文台利用其两个光度计在远红外中观测这颗小行星进行了一次合作观察活动，该波长不在罗塞塔仪器的覆盖范围内。使用基于原位图像的形状模型作为输入输入到热物理模型（TPM）中的Herschel观测值也与〜70个Lutetia多波长观测值进一步相关。我们确认由罗塞塔（Rosetta）测量的几何反照率，根据小行星的有效直径得出H-mag值，并指向（21）热惯性极低（5J m〜（-2）s〜（-0.5）的Lutetia K〜（-1））。这种热惯性只有通过存在大量小规模的粗糙度才能实现，而Rosetta板上的OSIRIS（光学，光谱和红外成像系统）仪器无法直接观察到这种小规模的粗糙度。此外，我们的研究结果表明，位于罗塞塔（Rosetta）观察不到的小行星南部区域存在丘陵/火山口表面特征。根据我们的结果，我们得出结论，只有通过原位和遥感观测的合并，才能获得这颗小行星的真实全貌。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.192-199|共8页
  • 作者

    L ORourke; T. Mueller; I. Valtchanov; B. Altieri; B.M. Gonzalez-Garcia; B. Bhattacharya; L. Jorda; B. Carry; M. Kueppers; O. Groussin; K. Altwegg; M.A. Barucci; D. Bockelee-Morvan; J. Crovisier; E. Dotto; P. Garcia-Lario; M. Kidger; A. Llorente; R. Lorente; A.P. Marston; M. Sanchez Portal; R. Schulz; M. Sierra; D. Teyssier; R. Vavrek;

  • 作者单位

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    Max-Planck Institut fuer Extraterrestrische Physik (MPE) Garching, Germany;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    INSA at ESAC (European Space Astronomy Centre), E-28691 Villanueva de la Canada, Madrid, Spain;

    NHSC, IPAC, CA, USA;

    Laboratoire d'Astrophysique de Marseille, Marseille, France;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    Laboratoire d'Astrophysique de Marseille, Marseille, France;

    Bern University, Switzerland;

    LESIA, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon, France;

    LESIA, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon, France;

    LESIA, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon, France;

    INAF Osservatorio Astronomico di Roma;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESA Research and Scientific Support Department, ESTEC, Noordwijk, Netherlands;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

    ESAC (European Space Astronomy Centre), PO Box 78, 28691 Villanueva de la Canada, Madrid, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lutetia; herschel; rosetta; thermophysical modelling; TPM; thermal inertia; albedo; H-mag;

    机译：黄体;赫歇尔;罗塞塔;热物理模型;TPM;热惯性;反照率;H-mag;

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