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The influence of the brightness of the asteroidal dust bands on the gegenschein |
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| Authors: | Tadashi Mukai Masanori Fujino Ryosuke Nakamura Fumihiko Usui |
| Institution: | a Graduate School of Science and Technology, Kobe University, Nada, Kobe 657-8501, Japan b Planetary Science Division, ISAS, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan c Earth Observation Research Center, National Space Development Agency of Japan, Tsukuba, Ibaraki 305-8505, Japan d Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan e Department of Science Education, Kangwon National University, Chunchon 200-701, Korea |
| Abstract: | The position and shape of the Gegenschein’s maximum brightness provide information on the structure of the interplanetary dust cloud. We show that the asteroidal dust bands, extended near the anti-solar point, play an important role in determining both the position of the maximum brightness and the shape of the Gegenschein. After removing the asteroidal dust bands from an observation of the Gegenschein on November 2, 1997, it was found that the maximum brightness point shifted −0.4° in ecliptic latitude, i.e., to the south of the ecliptic plane, at an ecliptic longitude of 180°, in contrast to a latitude value of +0.1° when the dust bands were included. Furthermore, the part of the Gegenschein to the south of the ecliptic plane was brighter than the northern part at the time of observation. Referring to the cloud model of T. Kelsall et al. (1998, Astrophy. J. 508, 44-73), it can be estimated that the ascending node of the symmetry plane of the dust cloud is 57°−3°+7° when its inclination is 2.03° ? 0.50°. |
| Keywords: | Asteroids Dust bands Zodiacal light Gegenschein |
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