Optical Response and Surface Physical Properties of the Lunar Regolith at Reiner Gamma Formation from Clementine Orbital Photometry: Derivation of the Hapke Parameters at Local Scale

Introduction: In the last decade, integrated telescopic and spaceborne photometric observation of planetary regolith has progressively evolved from wholedisk toward disk-resolved measurements at regional scales [e.g.,1,2,3,4,5], and more recently toward local scale studies [e.g.,6,7,8,9]. Intriguing areas named swirls have been identified for long as they display regional and local anomalous photometric behaviors. In particular, previous investigations conducted from UVVIS telescopic and Clementine spectral images have established the peculiar optical behavior of the lunar regolith at Reiner Gamma Formation [6,9,10,11]. We present here the derivation of the set of Hapke parameters for this area, using a multiangular dataset derived from Clementine orbital imaging.