[PPS03-P24] Disk-Resolved Photometry Analysis of the Asteroid Ryugu Images Obtained by Hayabusa2 Visible Camera ONC
Keywords:Asteroid, Photometry, Ryugu, Hayabusa2
Since Hayabusa2’s position is nominally fixed on the line connecting Ryugu and the Earth, the available solar phase angle range by ONC-T changes seasonally with the orbits of Earth and Ryugu around the sun. Therefore, we are collecting a large number of ONC-T images over a long period of time to cover a wide phase angle range.
ONC-W1 data has a strong point that it covers a wide phase angle range within a single frame during the descent operations, because of its wide field of view. One of our current challenges is deriving a precise viewing geometries (incidence angle, emission angle, and phase angle) at each pixel. Additionally, comparison of the absolute brightness value (radiance factor) with ONC-T is an ongoing issue.