TY - JOUR

T1 - Asteroid taxonomic signatures from photometric phase curves

AU - Oszkiewicz, Dagmara Anna

AU - Bowell, Edward

AU - Wasserman, L. H.

AU - Muinonen, Karri

AU - Penttilä, Antti

AU - Pieniluoma, Tuomo

AU - Trilling, David E.

AU - Thomas, Cristina A.

N1 - Funding Information:
Research has been supported by the Magnus Ehrnrooth Foundation, Academy of Finland (Project No. 127461), Lowell Observatory, and the Spitzer Science Center. We would like to thank Dr. Michael Thomas Flanagan (University College London) for developing and maintaining the Java Scientific Library, which we have used in the Asteroid Phase Function Analyzer. D.O. thanks Berry Holl for help with Java plotters and Saeid Zoonemat Kermani for valuable advice on Java applets. We thank the Department of Physics of Northern Arizona University for CPU time on its Javelina open cluster allocated for our computing.

PY - 2012/5

Y1 - 2012/5

N2 - We explore the correlation between an asteroid's taxonomy and photometric phase curve using the H, G 12 photometric phase function, with the shape of the phase function described by the single parameter G 12. We explore the usability of G 12 in taxonomic classification for individual objects, asteroid families, and dynamical groups. We conclude that the mean values of G 12 for the considered taxonomic complexes are statistically different, and also discuss the overall shape of the G 12 distribution for each taxonomic complex. Based on the values of G 12 for about half a million asteroids, we compute the probabilities of C, S, and X complex membership for each asteroid. For an individual asteroid, these probabilities are rather evenly distributed over all of the complexes, thus preventing meaningful classification. We then present and discuss the G 12 distributions for asteroid families, and predict the taxonomic complex preponderance for asteroid families given the distribution of G 12 in each family. For certain asteroid families, the probabilistic prediction of taxonomic complex preponderance can clearly be made. In particular, the C complex preponderant families are the easiest to detect, the Dora and Themis families being prime examples of such families. We continue by presenting the G 12-based distribution of taxonomic complexes throughout the main asteroid belt in the proper element phase space. The Nysa-Polana family shows two distinct regions in the proper element space with different G 12 values dominating in each region. We conclude that the G 12-based probabilistic distribution of taxonomic complexes through the main belt agrees with the general view of C complex asteroid proportion increasing towards the outer belt. We conclude that the G 12 photometric parameter cannot be used in determining taxonomic complex for individual asteroids, but it can be utilized in the statistical treatment of asteroid families and different regions of the main asteroid belt.

AB - We explore the correlation between an asteroid's taxonomy and photometric phase curve using the H, G 12 photometric phase function, with the shape of the phase function described by the single parameter G 12. We explore the usability of G 12 in taxonomic classification for individual objects, asteroid families, and dynamical groups. We conclude that the mean values of G 12 for the considered taxonomic complexes are statistically different, and also discuss the overall shape of the G 12 distribution for each taxonomic complex. Based on the values of G 12 for about half a million asteroids, we compute the probabilities of C, S, and X complex membership for each asteroid. For an individual asteroid, these probabilities are rather evenly distributed over all of the complexes, thus preventing meaningful classification. We then present and discuss the G 12 distributions for asteroid families, and predict the taxonomic complex preponderance for asteroid families given the distribution of G 12 in each family. For certain asteroid families, the probabilistic prediction of taxonomic complex preponderance can clearly be made. In particular, the C complex preponderant families are the easiest to detect, the Dora and Themis families being prime examples of such families. We continue by presenting the G 12-based distribution of taxonomic complexes throughout the main asteroid belt in the proper element phase space. The Nysa-Polana family shows two distinct regions in the proper element space with different G 12 values dominating in each region. We conclude that the G 12-based probabilistic distribution of taxonomic complexes through the main belt agrees with the general view of C complex asteroid proportion increasing towards the outer belt. We conclude that the G 12 photometric parameter cannot be used in determining taxonomic complex for individual asteroids, but it can be utilized in the statistical treatment of asteroid families and different regions of the main asteroid belt.

KW - Asteroids

KW - Asteroids, Composition

KW - Asteroids, Surfaces

KW - Photometry

KW - Regoliths

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U2 - 10.1016/j.icarus.2012.02.028

DO - 10.1016/j.icarus.2012.02.028

M3 - Article

AN - SCOPUS:84859010180

SN - 0019-1035

VL - 219

SP - 283

EP - 296

JO - Icarus

JF - Icarus

IS - 1

ER -