  Time-series multi-band photometry and spectrometry were performed in
Nov.-Dec. 2017 to investigate the homogeneity of the surface of asteroid (3200)
Phaethon. We found that Phaethon is a B-type asteroid, in agreement with
previous studies, and that it shows no evidence for rotational color variation.
The sub-solar latitude during our observation period was approximately 55
degree S, which corresponded to the southern hemisphere of Phaethon. Thus, we
found that the southern hemisphere of Phaethon has a homogeneous surface. We
compared our spectra with existing spectral data to examine the latitudinal
surface properties of Phaethon. The result showed that it doesn't have a
latitudinal color variation. To explain this observation, we investigated the
solar-radiation heating effect on Phaethon, and the result suggested that
Phaethon underwent a uniform thermal metamorphism regardless of latitude, which
was consistent with our observations. Based on this result, we discuss the
homogeneity of the surface of Phaethon.
