Dust Activity in Comet 67P/Churyumov–Gerasimenko from February 20 to April 20, 2003
Dust Activity in Comet 67P/Churyumov–Gerasimenko from February 20 to April 20, 2003
复制标题
2003年2月20日至4月20日彗星67P/Churyumov-Gerasimenko的尘埃活动
DOI：
10.1007/s11038-006-9067-9
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Gutiérrez
中科院分区：
文献类型：
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作者：
L. Lara;J. Leon;J. Licandro;P. Gutiérrez
67 P/Churyumov-Gerasimenko彗星的宽带成像为欧空局罗塞塔使命的目标特征提供了更多的数据。在rh=2.37和rh=2.78 Au后近日点之间的彗星监测显示出一个突出的尘埃彗发，从核延伸到大约25，000公里，以及一个大约反尾方向的长尘埃结构，达到至少230，000公里，被确定为颈线结构。非各向同性的尘埃排放是从彗发内部的结构中检测到的，它反映在表面亮度轮廓与彗星中心投影距离的线性拟合的斜率上，以m <$0.83 −0.941表示。除了在295°位置角处的长尘埃尖峰外，尘埃彗发的形态学研究证实了在
95和
195°，在ρ ≤ 30，000 km处，尘埃过剩可高达50%。由我们的R宽带数据得到的Af ρ参数在后近日点rh=2.37和2.48 Au处分别为26.0和29.8 cm。尘埃反射率S′（λ）是尘埃颜色的量度，为0.061±0.019，是一种相当中性的颜色。
AbstractBroadband imaging of Comet 67P/Churyumov–Gerasimenko has provided more data on the characterisation of the target of the ESA Rosetta Mission. The comet monitoring between rh=2.37 and rh=2.78 AU postperihelion shows a prominent dust coma which extends up to ≈ 25,000 km from the nucleus, and a long dust structure in approximately anti-tail direction, reaching at least 230,000 km, identified as a neck-line structure. The non-isotropic dust emission is detected from the structures in the inner coma, and it is reflected on the slope of linear fits of surface brightness profiles vs. cometocentric projected distance in log–log representation as m ≈ 0.83−0.941. Besides the long dust spike at position angle of 295°, the morphological study of the dust coma confirms the presence of two structures at position angles of
95 and
195° where the overabundance of dust can be as high as 50% at ρ ≤ 30,000 km. The Af ρ parameter derived from our R broadband data is 26.0 and 29.8 cm at rh=2.37 and 2.48 AU postperihelion. The dust reflectivity S′(λ), a measurement of the dust colour, is 0.061±0.019, a rather neutral colour.