MOLINARO, MarcoMarcoMOLINARO0000-0001-5028-6041Shortridge, KeithKeithShortridgePASIAN, FabioFabioPASIAN0000-0002-4869-32272021-03-102021-03-102019978-1-58381-929-6978-1-58381-930-2http://hdl.handle.net/20.500.12386/30695This volume contains papers presented at the twenty-sixth annual conference on Astronomical Data Analysis Software and Systems (ADASS XXVI). The ADASS conference is the premier conference for the exchange of information about astronomical software and is held each year, hosted by a different astronomical institution. The conference provides a forum for astronomers, software engineers and data specialists from all around the world to discuss software, algorithms, technologies and recommendations applied to all aspects of astronomy, from telescope operations to data reduction, from data management to computing. The key themes for ADASS XXVI included: long-term data management in astronomical data archives, management of scientific and data analysis projects, connections between large databases and data reduction and analysis, HPC and distributed computing, the usage of Python in astronomy, and others. The conference also touched upon data modelling in astronomy and other topics, including demo booths, "bird of a feather" sessions, focus demos, and tutorials. This proceedings volume presents over a hundred and eighty reports from the oral, posters and other contributions to the conference.STAMPAenBook/Proceedings editinghttps://myasp.astrosociety.org/product/CS521/vol-521-astronomical-data-analysis-software-and-systems-xxvi2019ASPC..521.....MFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE6 Computer Science and Informatics: Informatics and information systems, computer science, scientific computing, intelligent systems::PE6_10 Web and information systems, database systems, information retrieval and digital libraries, data fusion