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Comet Fading Begins Beyond Saturn2
No full textIncluded are the raw simulation results of comet production along with the python script ('fancyplotbuilder.py') needed to generate each figure in the main paper. Simulation set is divided into 100 subsimulation directories that are co-added to comprise a single simulation.The discovery probability of long-period comets (LPCs) passing near the Sun is highest during their first passage and then declines, or fades, during subsequent return passages. Comet fading is largely attributed to devolatilization and fragmentation via thermal processing within 2--3 au of the Sun (1 au being the Earth-Sun distance). Here our numerical simulations show that comet observing campaigns miss vast numbers of LPCs making returning passages through the Saturn region (near 10 au) because these comets fade during prior, even more distant passages exterior to Saturn and thus elude detection. Consequently, comet properties significantly evolve at solar distances much larger than previously considered, and this offers new insights into the physical and dynamical properties of LPCs, both near and far from Earth.Ye
Professional–Collector Collaboration: Moving beyond Debate to Best Practice
Get PDFThis article introduces the first of what will ultimately be two collections of case studies in archaeologist–responsible/responsive artifact collector collaboration. Focused on the United States, the articles in this issue of Advances in Archaeological Practice share the thoughts and experiences of archaeologists representing diverse employment sectors (compliance, agency, museum, and university), artifact collectors, and members of descendant communities. Research areas extend from California to Virginia and from Ohio to the Texas/Mexico border. The breadth of the writers' backgrounds and their focal regions reinforce the wide applicability of collaborative best practices. Every author explicitly treats two subjects: (1) the intersection of their work with the Society for American Archaeology's (SAA) recently published guidelines for ethical professional–collector collaboration, and (2) their own practical suggestions for establishing and nurturing those relationships. This introductory article provides an overview of each of the other contributions, notes how the contributions articulate with the SAA guidelines, and offers its own, mostly philosophical suggestions for prospective members of professional–collector collaborations.
Este artículo introduce la primera de las que eventualmente serán dos colecciones de casos prácticos en colaboración responsable / receptiva entre arqueólogos y coleccionistas de artefactos. Centrados en los Estados Unidos, los artículos de esta edición de Advances in Archaeological Practice comparten los pensamientos y experiencias de arqueólogos que representan diversos sectores laborales (cumplimiento regulatorio, agencia, museo y universidad); coleccionistas de artefactos; y miembros de comunidades descendientes. Las áreas de investigación se extienden desde California hasta Virginia y desde Ohio hasta la frontera entre Texas y México. La amplitud del historial los escritores y sus regiones focales refuerza la amplia aplicabilidad de las mejores prácticas colaborativas. Cada autor versa explícitamente dos temas: la intersección de su trabajo con las directrices publicadas recientemente por la Sociedad para la Arqueología Americana (SAA) para la colaboración ética entre profesionales y coleccionistas; y sus propias sugerencias prácticas para establecer y nutrir esas relaciones. Este artículo introductorio resume cada trabajo, señala cómo cumple con las pautas de la SAA y ofrece sus propias sugerencias, principalmente filosóficas, para futuros miembros sobre las colaboraciones entre coleccionistas y profesionales.Ye
