(3200) Phaethon is an active near-Earth asteroid with a diameter of ∼5 km. It is the parent body of the Geminid meteors and only ejects dust during its perihelion passage. It is the flyby target of the DESTNY+ mission, which was selected for the JAXA/ISAS small-class space science program in 2017. By numerous observations with different methods, a rotation period, average colors, rough size and shape, and reflectance spectra of Phaethon have been obtained. Interestingly, it is found that Phaethon shows spectral variation spatially and/or temporally in the wavelength range near 350 nm to 550 nm. The B-type asteroids, like Phaethon, are linked with carbonaceous species and phyllosilicates; both of these materials exhibit diagnostic spectral features in the UV. Thus, we would like to obtain spectra of Phaethon with Subaru/FOCAS to investigate the 350-550 nm region. The near UV-visible spectra obtained with Subaru/FOCAS will be compared with laboratory measurements of candidate materials. This will help characterize its spectral shape deeper so that we can look for carbon signatures and understand the spectral properties of Phaethon.
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