LEADER: fast estimates of asteroid shape elongation and spin latitude distributions from scarce photometry

TL;DR

LEADER is a fast, robust software tool that estimates asteroid shape elongation and spin latitude distributions from scarce photometric data for large populations, enabling statistical analysis despite limited individual observations.

Contribution

It introduces a novel method and software for efficiently estimating asteroid shape and spin distributions from large, sparse datasets, including validation and population comparison tools.

Findings

LEADER accurately estimates population distributions from synthetic data.

Results vary with data quality and coverage across different asteroid databases.

The method enables large-scale asteroid population analysis despite limited individual data.

Abstract

Many asteroid databases with lightcurve brightness measurements (e.g. WISE, Pan-STARRS1) contain enormous amounts of data for asteroid shape and spin modelling. While lightcurve inversion is not plausible for individual targets with scarce data, it is possible for large populations with thousands of asteroids, where the distributions of the shape and spin characteristics of the populations are obtainable. We aim to introduce a software implementation of a method that computes the joint shape elongation p and spin latitude beta distributions for a population, with the brightness observations given in an asteroid database. Other main goals are to include a method for performing validity checks of the algorithm, and a tool for a statistical comparison of populations. The LEADER software package read the brightness measurement data for a user-defined subpopulation from a given database. The observations were used to compute estimates of the brightness variations of the population members. A cumulative distribution function (CDF) was constructed of these estimates. A superposition of known analytical basis functions yielded this CDF as a function of the (shape, spin) distribution. The joint distribution can be reconstructed by solving a linear constrained inverse problem. To test the validity of the method, the algorithm can be run with synthetic asteroid models, where the shape and spin characteristics are known, and by using the geometries taken from the examined database. LEADER is a fast and robust software package for solving shape and spin distributions for large populations. There are major differences in the quality and coverage of measurements depending on the database used, so synthetic simulations are always necessary before a database can be reliably used. We show examples of differences in the results when switching to another database.