Sorcha: A Solar System Survey Simulator for the Legacy Survey of Space and Time

TL;DR

Sorcha is an open-source, scalable Python-based survey simulator designed to model detection biases in the LSST solar system survey, capable of handling billions of objects and adaptable to other surveys.

Contribution

It introduces Sorcha, a comprehensive and flexible survey simulator tailored for the LSST, capable of large-scale simulations and adaptable to various survey designs.

Findings

Supports simulation of billions of objects

Flexible modular design for different surveys

Optimized for high-performance computing environments

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 ten-year wide-field survey will collect billions of observations and discover a predicted $\sim$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 (HPC) clusters, allowing for repeated simulation of millions to billions of objects (both real and synthetic).