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We report on optical polarimetric observations of two Apollo type near-Earthasteroids, (422699) 2000 PD3 and (3200) Phaethon, and BVRI photometricobservations of 2000 PD3 using the 1.6m Pirka telescope in 2017. We derived thegeometric albedo of pv = 0.22 +- 0.06 and the color indices (B-V = 0.282 +-0.072, V-R = 0.198 +- 0.035 and V-I = 0.203 +- 0.022) for 2000 PD3 which areconsistent with those of S-type asteroids (including Q-types). The effectivediameter of 2000 PD3 was derived as 0.69 +- 0.15 km using our derived geometricalbedo. We found that our polarimetric data of Phaethon in 2017 is deviatedfrom the polarimetric profile taken at different epoch of 2016 using theidentical instrument setting (Ito et al., 2018). This result suggests thatPhaethon would have a regional heterogeneity in grain size and/or albedo on itssurface.

Polarimetric and Photometric Observations of NEAs; (422699) 2000 PD3 and (3200) Phaethon with the 1.6m Pirka Telescope