Sorcha: A Solar System Survey Simulator for the Legacy Survey of Space and Time
Abstract The upcoming Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory is expected to revolutionize solar system astronomy. Unprecedented in scale, this 10 yr wide-field survey will collect billions of observations and discover a predicted ∼5 million new solar system objects. Like all astronomical surveys, its results will be affected by a complex system of intertwined detection biases. Survey simulators have long been used to forward-model the effects of these biases on a given population, allowing for a direct comparison to real discoveries. However, the scale and tremendous scope of the LSST requires the development of new tools. In this paper we present Sorcha , an open-source survey simulator written in Python . Designed with the scale of LSST in mind, Sorcha is a comprehensive survey simulator to cover all solar system small-body populations. Its flexible, modular design allows Sorcha to be easily adapted to other surveys by the user. The simulator is built to run both locally and on high-performance computing clusters, allowing for repeated simulation of millions to billions of objects (both real and synthetic).
Authors
- Samuel Cornwall (ORCID: https://orcid.org/0000-0002-0672-5104)
- Peter Yoachim (ORCID: https://orcid.org/0000-0003-2874-6464)
- Siegfried Eggl (ORCID: https://orcid.org/0000-0002-1398-6302)
- Megan E. Schwamb (ORCID: https://orcid.org/0000-0003-4365-1455)
- Shantanu P. Naidu (ORCID: https://orcid.org/0000-0003-4439-7014)
- Michael S. P. Kelley (ORCID: https://orcid.org/0000-0002-6702-7676)
- Joachim Moeyens (ORCID: https://orcid.org/0000-0001-5820-3925)
- Jeremy Kubica (ORCID: https://orcid.org/0009-0009-2281-7031)
- C. Snodgrass (ORCID: https://orcid.org/0000-0001-9328-2905)
- Stephanie R. Merritt (ORCID: https://orcid.org/0000-0001-5930-2829)
- Maxine West (ORCID: https://orcid.org/0009-0003-3171-3118)
- Shannon M. Matthews (ORCID: https://orcid.org/0000-0001-8633-9141)
- Mario Jurić (ORCID: https://orcid.org/0000-0003-1996-9252)
- J Murtagh (ORCID: https://orcid.org/0000-0001-9505-1131)
- Lynne Jones (ORCID: https://orcid.org/0000-0001-5916-0031)
- G. Fedorets (ORCID: https://orcid.org/0000-0002-8418-4809)
- Matthew J. Holman (ORCID: https://orcid.org/0000-0002-1139-4880)
- Pedro H. Bernardinelli (ORCID: https://orcid.org/0000-0003-0743-9422)
- Colin Orion Chandler (ORCID: https://orcid.org/0000-0001-7335-1715)
- Drew Oldag
- Jacob A. Kurlander (ORCID: https://orcid.org/0009-0005-5452-0671)
- Ryan R. Lyttle
- Kathleen Kiker
Publication Details
- Journal
- The Astronomical Journal
- Published
- 2025-07-21
- DOI
- https://doi.org/10.3847/1538-3881/add3ec
- Citations
- 4
- Primary Topic
- Astro and Planetary Science
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Gordon and Betty Moore Foundation
- Washington Research Foundation
- University of Washington
- Breakthrough Prize Foundation
- Department for the Economy
- European Commission
- Engineering and Physical Sciences Research Council
- Science and Technology Facilities Council
- SLAC National Accelerator Laboratory