Distant activity of 67P/Churyumov-Gerasimenko in 2014: Ground-based results during the Rosetta pre-landing phase
Distant activity of 67P/Churyumov-Gerasimenko in 2014: Ground-based results during the Rosetta pre-landing phase
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2014 年 67P/Churyumov-Gerasimenko 的远程活动：罗塞塔预着陆阶段的地面结果
DOI：
10.1051/0004-6361/201527834
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发表时间：
2016
影响因子：
6.5
通讯作者：
A. Guilbert
中科院分区：
文献类型：
--
作者：
C. Snodgrass;E. Jehin;J. Manfroid;C. Opitom;A. Fitzsimmons;G. Tozzi;S. Faggi;Bin Yang;M. Knight;B. Conn;T. Lister;O. Hainaut;D. Bramich;S. Lowry;A. Rożek;C. Tubiana;A. Guilbert
上下文2014年，随着欧空局罗塞塔使命接近、环绕并向彗星67 P/Churyumov-Gerasimenko发送着陆器，一系列大型地面观测活动也随之而来。
目标。我们约束的总活动水平的彗星测光和光谱放置罗塞塔结果的背景下，并了解大尺度结构的彗星的彗发前近日点。
方法.我们使用一些望远镜进行观测，但集中在智利的8米VLT和双子座南望远镜的结果。我们使用R波段成像来测量尘埃彗发对彗星亮度的贡献，并使用紫外可见光谱来寻找气体排放，主要是使用VLT/FORS。此外，我们在2014年底用Gemini-S/Flamingos-2在近红外波长（JHK）下对彗星进行了成像。
结果我们发现这颗彗星在2014年初已经活跃在日心距离超过4 Au的地方。总活动（用尘埃测量）的演变遵循了先前的预测。尽管进行了敏感的搜索，但没有发现气体排放。
结论.这颗彗星在不同轨道之间保持着相似的活动水平，从这个意义上说，它是可预测的，这意味着罗塞塔的结果与这颗彗星的典型行为相对应。气体的产生（至少对于CN）相对于近日点是高度不对称的，因为我们的上限低于在以前的轨道中在近日点后类似距离处测得的生产率。
Context. As the ESA Rosetta mission approached, orbited, and sent a lander to comet 67P/Churyumov-Gerasimenko in 2014, a large campaign of ground-based observations also followed the comet.
Aims. We constrain the total activity level of the comet by photometry and spectroscopy to place Rosetta results in context and to understand the large-scale structure of the comet’s coma pre-perihelion.
Methods. We performed observations using a number of telescopes, but concentrate on results from the 8 m VLT and Gemini South telescopes in Chile. We use R-band imaging to measure the dust coma contribution to the comet’s brightness and UV-visible spectroscopy to search for gas emissions, primarily using VLT/FORS. In addition we imaged the comet in near-infrared wavelengths (JHK) in late 2014 with Gemini-S/Flamingos-2.
Results. We find that the comet was already active in early 2014 at heliocentric distances beyond 4 au. The evolution of the total activity (measured by dust) followed previous predictions. No gas emissions were detected despite sensitive searches.
Conclusions. The comet maintains a similar level of activity from orbit to orbit, and is in that sense predictable, meaning that Rosetta results correspond to typical behaviour for this comet. The gas production (for CN at least) is highly asymmetric with respect to perihelion, as our upper limits are below the measured production rates for similar distances post-perihelion in previous orbits.
67P/Churyumov-Gerasimenko 彗星近日点前的活动
影响因子：
6.5
作者：
Guilbert-Lepoutre A
通讯作者：
Guilbert-Lepoutre A
使用罗塞塔上的 OSIRIS 相机进行进近观测所得的 67P/Churyumov-Gerasimenko 的旋转状态
影响因子：
6.5
作者：
Mottola S
通讯作者：
Mottola S