Fig. 9: Diurnal peak temperature at equinox as a function of heliocentric distance.
From: Spectrally blue hydrated parent body of asteroid (162173) Ryugu
North pole (black) and Otohime Facets (A: blue, B: cyan, C: red) are compared with the Ryugu average (gray solid line) and the equatorial ridge (gray dashed line). The equatorial ridge is defined as latitude from 5°S to 5°N. 570 K where phyllosilicates start to decompose is shown by black dashed horizontal line. North pole is kept lower than 570 K at 0.4 au, while Otohime Saxum is heated higher than 570 K.
