A new three-parameter H, G<sub>1</sub>, G<sub>2</sub> magnitude phase function for asteroids

Creators: Cellino, A.; Belskaya, I.; Delbo, M.; Levasseur-Regourd, Anny Chantal; Muinonen, K.; Pentillä, A.; Tedesco, E. F.

Others:: INAF - Osservatorio Astrofisico di Torino (OATo) ; Istituto Nazionale di Astrofisica (INAF); Institute of Astronomy [Kharkiv] ; V.N. Karazin Kharkiv National University (KhNU); Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS); PLANETO - LATMOS ; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Finnish Geodetic Institute (FGI); Department of Physics [Helsinki] ; Falculty of Science [Helsinki] ; Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki; Planetary Science Institute [Tucson] (PSI); K. Muinonen; A. Pentillä; H. Lindqvist; T. Nousiainen and G. Videen

Description

We have developed a new three-parameter H, G₁, G₂ magnitude phase function for asteroids. The phase function is aimed at replacing the currently adopted two-parameter H, G phase function. We show that H, G₁, G₂ produces better fits of available magnitude - phase curves of well-observed asteroids. We show also that the new system can be conveniently reduced to a two-parameter H, G₁₂ magnitude phase function, which allows us to derive better estimates of the absolute magnitudes of asteroids for which poorly-sampled magnitude phase curves are available.

Abstract

International audience

A new three-parameter H, G<sub>1</sub>, G<sub>2</sub> magnitude phase function for asteroids

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