H,G1,G2 photometric phase function extended to low-accuracy data

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Penttilä , A I , Shevchenko , V G , Wilkman , O V & Muinonen , K O 2016 , ' H,G1,G2 photometric phase function extended to low-accuracy data ' , Planetary and Space Science , vol. 123 , pp. 117-125 . https://doi.org/10.1016/j.pss.2015.08.010

Title: H,G1,G2 photometric phase function extended to low-accuracy data
Author: Penttilä, Antti Ilmari; Shevchenko, V. G.; Wilkman, Olli Verner; Muinonen, Karri Olavi
Contributor organization: Department of Physics
Planetary-system research
Date: 2016
Language: eng
Number of pages: 9
Belongs to series: Planetary and Space Science
ISSN: 0032-0633
DOI: https://doi.org/10.1016/j.pss.2015.08.010
URI: http://hdl.handle.net/10138/160723
Abstract: We introduce a constrained nonlinear least-squares algorithm to be used in estimating the parameters in the H,G1,G2 phase function. As the algorithm works directly in the magnitude space, it will surpass the possible bias problem that may be present in the existing H,G1,G2 fit procedure when applied to lowaccuracy observations with large magnitude variations. With constraints on the photometric phase-curve shape parameters G1 and G2, it guarantees a physically reasonable phase-curve estimate. With a new data set of 93 asteroids, we reassess the two-parameter version of the H,G1,G2 function. Finally, we introduce a one-parameter version of the phase function that can give a suggestion of the asteroids taxonomic group based only on its phase curve. A statistical model selection procedure is presented that can automatically select between the different versions of the photometric phase functions. An online tool that implements these algorithms is introduced.
Subject: 115 Astronomy, Space science
magnitude system
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: submittedVersion

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