Fig. 1: The hyperbola-shaped ray of the Hokusai crater.
a Visible rays of the Hokusai crater (rim-to-rim diameter D = 114 km; 16.8°E, 57.8°N) cover most parts of the planet (green lines). The distribution of the rays was updated from an earlier mapping26 (see Methods). The white dashed curve is a planet-centered great circle that passes the western branch of the curved ray. b–d MESSENGER enhanced color mosaic, optical maturity index, and spectral slopes of reflectances at visible to near-infrared (see Methods) for the curved ray, respectively. Image IDs used for this figure are listed in Supplementary Table 1.
