Introduction

The zodiacal light is the diffuse sunlight scattered by interplanetary dust particles. It is a difficult task to do high quality photometry of zodiacal light from a ground-based observatory because of its faintness as well as the contamination of diffuse light sources. Active ground-based studies were done in the 1960's and 1970's by using a photo-multiplier attached to a telescope on a high altitude mountain (see e.g. [1]). Their efforts have provided us with an overview of the zodiacal light, but they have also revealed limits of the ground-based observation with photomultiplier mounted on a telescope i.e. low spatial resolution and enormous observation time, compared with the spaceborne observations (see e.g. [2]).

About 20 years later, the high sensitivity and imaging capability of the Charge Coupled Device (CCD) has enabled us to obtain a 'snapshot' of diffuse faint objects with a portable

'Wide-field Imager of Zodiacal light with ARray Detector

2We obtained the first image from WIZARD in 2001 at Mauna Kea(4200 m, Hawaii) in collaboration with the SUBARU Telescope. In this paper, we describe the design and expected performance of WIZARD in this developing phase.

Filter

Figure 1. Plan for the lens unit. Rays at the center and edge of frame are drawn. Table 1

Filter

Window (CaF2, 8mm)

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