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A CCD search for the Earth-Moon libration clouds around L4

S. Takahashia M. Ishiguroa, Y. Fujiia, S. Urakawaa, C. Yoshishitaa, T. Mukaia and R. Nakamurab aGraduate School of Science and Technology, Kobe University, Japan bEarth Observing Research Center, National Space Development Agency of Japan

We attempted to detect the Earth-Moon libration clouds around L4 with a cooled CCD camera at Mauna Kea (4200m), Hawaii, on November 17 and 18, 1999. No significant enhancement of brightness larger than 1.5Sio© was found around L4. It seems that the brightness of the libration clouds in 1999, if it existed, would be fainter than that reported previously by Kordylewski [1] and Roach [2].

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