No significant brightness enhancement associated with the orbit of asteroid 3200 Phaethon (potential parent body of the Geminid meteoroid stream) appears in our CCD photometry of the zodiacal light. It should be noted that our search was done for the trail structure with an angular scale of between 0.7° and 5.0° by applying a Fourier filtering

Separation from the orbit of Phaethon (degrees)

Separation from the orbit of Phaethon (degrees)

Figure 2. Brightness profile of Fourier-filtered image along the line perpendicular to the orbit of Phaethon, where the brightness is in unit of [email protected], and it is averaged over the direction parallel to the orbit of Phaethon.

process. If the dust trails had a narrow structure, less than our angular resolution of observation (0.62° or ~15 pixels) we would have been able to distinguish the structure from the background zodiacal light. Up to now, we have not yet determined the origin of faint structure detected at ¡3 — 6° and A — A® = 78° in [2], One of the reasons for our negative result may come from the difference in the solar elongation angle between 90°-120° in this observation and 78° in [2], The brightness of dust trails may depend on the solar elongation angle. Further searches for dust trails associated with active meteor showers will be done using a new CCD instrument developed in [6].

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