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首页> 外文期刊>Planetary and space science >The light curve of asteroid 21 Lutetia measured by VIRTIS-M during the Rosetta fly-by
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The light curve of asteroid 21 Lutetia measured by VIRTIS-M during the Rosetta fly-by

机译：在Rosetta飞越过程中通过VIRTIS-M测量的小行星21 Lutetia的光曲线

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摘要

On 10 July 2010, the Rosetta spacecraft encountered the asteroid 21 Lutetia on its way to the comet 67P/Churyumov-Gerasimenko. This was the second of two planned asteroid fly-bys performed by the probe, the first fly-by being with the much smaller asteroid 2867 Steins in September 2008. The VIRTIS imaging spectrometer (angular resolution 0.250 mrad, overall spectral range 0.25-5.1 μm) onboard Rosetta acquired data of Lutetia well before the closest approach phase, when the target was spatially unresolved, in order to obtain a light curve of the asteroid in the infrared spectral range extending up to 5 μm. Two light curve sequences were obtained, separated by a gap of 3.25 h. During the first light curve, the solar phase angle of the asteroid had a constant value of 10.8°, while in the second light curve it decreased from 10.7° to 7.8°. Assuming the latest value derived for the rotational period of Lutetia (8.168270 ± 0.000001 h, Carry et al., 2010), each of the light curve sequences covered roughly one rotation of the asteroid. In the overall campaign, VIRTIS collected a total of 16 cubes where Lutetia was captured 165 times, both in the visual and in the infrared range. Given the low signal and the unresolved appearance of the source in the first sequence and at the beginning of the second sequence, several wavelengths turn out to be unsuited to sample the light curve. Nevertheless, in both the VIS and IR ranges we find a similar trend, with two different maxima and minima during one rotational period. In the edge-on view with north pole tilted towards the spacecraft, we find that the near infrared spectrum of Lutetia in its northern hemisphere is essentially flat and grey, with no relevant absorption features in the range 1-3.5 μm within the sensitivity of the VIRTIS instrument. We find a marked spectral homogeneity throughout the two explored rotational periods within the 1 - σ variability of the data. Consistent with the results obtained at closest approach by Coradini et al. (2011), we confirm the absence of OH features at 1.9,2.7, and 3 μm, and no other absorption features are seen in the near infrared range 1-3.5 μm of VIRTIS data at northern latitudes.
机译：2010年7月10日，罗塞塔号飞船在前往彗星67P /丘留莫夫-格拉西缅科的途中遇到了小行星21 Lutetia。这是探测器进行的两次计划小行星飞越的第二次，第一次飞越是在2008年9月使用小得多的小行星2867 Steins。VIRTIS成像光谱仪（角分辨率为0.250 mrad，总光谱范围为0.25-5.1μm ）机上的罗塞塔号（Rosetta）在最接近进近阶段之前就已经获取了Lutetia的数据，这时该目标在空间上无法分辨，以便获得小行星在红外光谱范围内扩展至5μm的光曲线。获得了两个光曲线序列，间隔为3.25 h。在第一个光曲线期间，小行星的太阳相角具有恒定值10.8°，而在第二个光曲线中，它从10.7°减小至7.8°。假设得出Lutetia旋转周期的最新值（8.168270±0.000001 h，Carry等，2010），则每个光曲线序列大约覆盖了小行星的旋转一圈。在整个活动中，VIRTIS收集了总共16个立方体，其中在视觉和红外范围内捕获了165次Lutetia。在第一个序列中以及在第二个序列的开始，给定低信号和光源的未分辨外观，结果证明有几个波长不适合对光曲线进行采样。但是，在VIS和IR范围内，我们发现了相似的趋势，在一个旋转周期内有两个不同的最大值和最小值。在北极向航天器倾斜的侧面观察中，我们发现Lutetia在其北半球的近红外光谱基本上是平坦和灰色的，并且在1-3.5μm范围内没有相关的吸收特征。 VIRTIS仪器。我们在数据的1-σ变异性内的两个探索的旋转周期中发现了明显的光谱均匀性。与Coradini等人以最接近的方法获得的结果一致。 （2011年），我们确认在1.9、2.7和3μm处不存在OH特征，并且在北纬VIRTIS数据的1-3.5μm近红外范围内没有其他吸收特征。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.9-22|共14页
  • 作者

    F. Tosi; F. Capaccioni; A. Coradini; S. Erard; G. Filacchione; M.C. De Sanctis; M.T. Capria; S. Giuppi; F. Carraro;

  • 作者单位

    INAF-IFSI Istituto di Fisica delta Spazio Interplanetario, Via del Fosso del Cavaliere, 100,1-00133 Roma, Italy;

    INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100,1-00133 Roma, Italy;

    INAF-IFSI Istituto di Fisica delta Spazio Interplanetario, Via del Fosso del Cavaliere, 100,1-00133 Roma, Italy;

    LES1A, Observatoire de Paris/CNRS/UPMC/Universite Paris-Diderot, 5 place Jules Janssen, F-92195 Meudon, France;

    INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100,1-00133 Roma, Italy;

    INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100,1-00133 Roma, Italy;

    INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100,1-00133 Roma, Italy;

    LES1A, Observatoire de Paris/CNRS/UPMC/Universite Paris-Diderot, 5 place Jules Janssen, F-92195 Meudon, France;

    LES1A, Observatoire de Paris/CNRS/UPMC/Universite Paris-Diderot, 5 place Jules Janssen, F-92195 Meudon, France;

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  • 正文语种 eng
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  • 关键词

    asteroids; rotation; spectrophotometry; infrared observations;

    机译：小行星;自转;分光光度法;红外观测;

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