Infrared spectrophotometry of Comet IRAS-Araki-Alcock (1983d) - A bare nucleus revealed?
Infrared spectrophotometry of Comet IRAS-Araki-Alcock (1983d) - A bare nucleus revealed?
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IRAS-Araki-Alcock 彗星的红外分光光度测量 (1983d) - 揭示了裸露的彗核？
DOI：
10.1016/0019-1035(85)90174-5
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发表时间：
1985
期刊：
影响因子：
3.2
通讯作者：
A. Tokunaga
中科院分区：
文献类型：
--
作者：
M. Hanner;D. Aitken;R. Knacke;S. McCorkle;P. Roche;A. Tokunaga
1983年5月11日和5月12日分别在8 ~ 13 μm和2 ~ 4 μm波段获得了IRAS-Araki-Alcock彗星（1983d）核心和周围彗发的光谱。用4弧秒光束在10 μm处进行的空间分辨测量表明，中心核心比距离仅8弧秒的内彗发亮100倍以上；对于放射状流出的尘埃，亮度比将是8倍。对核心的观测结果与直接探测到的半径约为5公里的核一致。日照半球的温度为50 ~ 300 K。核心的光谱没有特征，而彗发的光谱显示出微弱的硅酸盐发射。光谱没有显示冰粒存在的证据。假设核上产尘区的气体通量为~ 10−5g/cm2/sec， 5月11.4日的产尘率为~ 105g/sec。
Spectra of the central core and surrounding coma of Comet IRAS-Araki-Alcock (1983d) were obtained at 8–13 μm on 11 May and 2–4 μm on 12 May 1983. Spatially resolved measurements at 10 μm with a 4-arcsec beam showed that the central core was more than 100 times brighter than the inner coma only 8 arcsec away; for radially outflowing dust, the brightness ratio would be a factor of 8. The observations of the central core are consistent with direct detection of a nucleus having a radius of approximately 5 km. The temperature of the sunlit hemisphere was > 300 K. Spectra of the core are featureless, while spectra of the coma suggest weak silicate emission. The spectra show no evidence for icy grains. The dust producton rate on 11.4 May was ∼ 105g/sec, assuming that the gas flux from the dust-producing areas on the nucleus was ∼ 10−5g/cm2/sec.