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Brightness distribution of zodiacal light observed by a cooled CCD camera at Mauna Kea

C. Yoshishita3, M. Ishiguro3, T. Mukaia and R. Nakamurab aGraduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan bEarth Observation Research Center, NASD A, Tokyo 106-0032, Japan

We performed the photometric observations of the zodiacal light at Mauna Kea (4200 m, Hawaii) during 5hl4m - 7h35m(UT) in December 16, 1998 by using a cooled CCD camera at an effective wavelength of about 500 nm (439-524 nm) with a fish-eye lens. Focusing on the smooth component of the zodiacal light, we have derived the inclination i = 2°.2 ± 0°.9 and the longitude of ascending node fl = 53° ± 7° of the symmetry plane. A significant discrepancy in fl between our new result and the previous reported values may suggest that the symmetry plane of zodiacal cloud cannot be fitted by a simple single plane. This suggestion comes from a fact that we used one snapshot taken in December, while the previous values came from the data averaged over the observations in a different season.

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