排序方式: 共有2条查询结果,搜索用时 4 毫秒
1
1.
Multiple non-resonance fluorescence lines of water (H2O) were detected in Comet 153/P Ikeya-Zhang (2002 C1) between UT 2002 March 21.9 (Rh=0.51 AU) and April 13.9 (Rh=0.78 AU), using the Cryogenic Echelle Spectrometer (CSHELL) at the NASA Infrared Telescope Facility. Analysis of 2.9-μm water lines enabled accurate determination of rotational temperatures on three dates. The derived H2O rotational temperatures were 138+6−5, 141+10−9, and 94±3 K on UT 2002 March 22.0, March 23.0, and April 13.8, respectively. Water production rates were retrieved from spectral lines measured in nineteen separate grating settings over seven observing periods. The derived heliocentric dependence of the water production rate was Q=(9.2±1.1)×1028[Rh(−3.21±0.26)] molecules s−1. The spatial distribution of H2O in the coma was consistent with its release directly from the nucleus (as a native source) on all dates. 相似文献
2.
Gerald Patrick Roberts Ian A. Crawford David Peacock Joyce Vetterlein Elisabeth Parfitt Louise Bishop 《Earth, Moon, and Planets》2007,100(1-2):1-16
High quality CCD images obtained at two different observatories in North Italy allowed the identification of four morphological
structures near the nuclear region of the comet Ikeya-Zhang (I-Z): haloes, jets, shells and spirals. The interpretation of
the nature of these structures has been attempted by means of a comparison of different up-to-date image processing techniques,
which led to a single common estimate of the rotation period (p=1.48±0.20 days). 相似文献
1