{"paper":{"title":"The Nature of Low-Albedo Small Bodies from 3-$\\mu$m Spectroscopy: One Group that Formed Within the Ammonia Snow Line and One that Formed Beyond It","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Amanda A. Sickafoose, Andrew S. Rivkin, Benjamin N. L. Sharkey, Ellen S. Howell, John W. Noonan, Joshua P. Emery, Laura M. Woodney, Lucas T. Mcclure, Matthew Richardson, Richard J. Cartwright, Sean Lindsay, Theodore Kareta","submitted_at":"2022-05-18T18:31:37Z","abstract_excerpt":"We present evidence, via a large survey of 191 new spectra along with previously-published spectra, of a divide in the 3-$\\mu$m spectral properties of the low-albedo asteroid population. One group (\"Sharp-types\" or ST, with band centers $<$ 3 $\\mu$m) has a spectral shape consistent with carbonaceous chondrite meteorites, while the other group (\"not-Sharp-types\" or NST, with bands centered $>$ 3 $\\mu$m) is not represented in the meteorite literature but is as abundant as the STs among large objects. Both groups are present in most low-albedo asteroid taxonomic classes, and except in limited cas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2205.09166","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2205.09166/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}