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

Abstract

We report on optical polarimetric observations of two Apollo type near-Earth asteroids, (422699) 2000 PD3 and (3200) Phaethon, and BVRI photometric observations of 2000 PD3 using the 1.6m Pirka telescope in 2017. We derived the geometric 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 are consistent with those of S-type asteroids (including Q-types). The effective diameter of 2000 PD3 was derived as 0.69 +- 0.15 km using our derived geometric albedo. We found that our polarimetric data of Phaethon in 2017 is deviated from the polarimetric profile taken at different epoch of 2016 using the identical instrument setting (Ito et al., 2018). This result suggests that Phaethon would have a regional heterogeneity in grain size and/or albedo on its surface.

arXiv comment32 pages, 4 figures, 5 tables accepted for publication in Planetary and Space Science

References in corpus (6)

• The colours of the Sun
• Near-Earth asteroid (3200) Phaethon. Characterization of its orbit, spin state, and thermophysical parameters
• The phase-polarization curve of asteroid (3200) Phaethon
• Rotational variation of the linear polarisation of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties
• Inversion angle of phase-polarization curve of near-Earth asteroid (3200) Phaethon
• Thermal Infrared and Optical Photometry of Asteroidal Comet C/2002 CE${}_{10}$

Cited by in corpus (3)

• Evidence of surface heterogeneity on active asteroid (3200) Phaethon
• Polarimetric Properties of the Near--Sun Asteroid (155140) 2005 UD in Comparison with Other Asteroids and Meteoritic Samples
• Asteroid (3200) Phaethon: results of polarimetric, photometric, and spectral observations