Search for the H Chondrite Parent Body among the Three Largest S-type Asteroids: (3) Juno, (7) Iris, and (25) Phocaea
AuthorNoonan, John W.
Harris, Walter M.
Bottke, William F.
Sanchez, Juan A.
Nallapu, Ravi Teja
Niazi, Haris Khan
Slick, Lindsay R.
Sharkey, Benjamin N. L.
Acuna, Derian D.
AffiliationUniv Arizona, Lunar & Planetary Lab
Univ Arizona, Dept Syst & Ind Engn
Univ Arizona, Coll Opt Sci
Keywordsinfrared: planetary systems
asteroids: individual (Juno, Iris, Phocaea)
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationJohn W. Noonan et al 2019 AJ 158 213
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractLinking meteorites to source regions in the main asteroid belt is important for understanding the conditions under which their parent bodies formed. Ordinary chondrites are the most abundant class of meteorites on Earth, totaling 86% of all collected samples. Some S-type asteroids/families have been proposed as sources for the three different (H, L, and LL) types of ordinary chondrites with Hebe, Agnia, Merxia, and Koronis families being the source for H chondrites, Gefion for H/L chondrites, and Flora family for LL chondrites. However, the composition and meteorite affinity of several large S-type main belt asteroids remains unconstrained leaving the possibility of additional source regions for ordinary chondrite meteorites. Here we investigate the surface composition of three large S-type asteroids, (3) Juno, (7) Iris, and (25) Phocaea, using their near-infrared spectra (0.7–2.55 μm) to identify the parent body of the H chondrites. We use a Bayesian inference model to confirm the meteorite analogs of the three asteroids. Based on our Bayes classifier we find the following analogs and probabilities: Juno is likely H chondrite (89%), Iris is likely LL chondrite (97.5%), and Phocaea is likely H chondrite (98.6%). While Phocaea has the highest probability of being an H chondrite, it is dynamically unlikely to deliver material to near-Earth space. While Juno has spectral properties similar to H chondrites, its family is unlikely to produce sizeable H-chondrite-type near-Earth objects (NEOs). If Juno is the primary source of H chondrite meteorites, it suggests that an additional source is needed to explain the H-chondrite-type NEOs.
VersionFinal published version
SponsorsNASA Near-Earth Object Observations (NEOO) program grant [NNXAL06G]; state of Arizona Technology Research Initiative Fund (TRIF)